Search | Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Index: D

-d0.1 switch

sendmail, 7.3.1. The hostname
sendmail, 11.6. Handling user@thishost
sendmail, 37.5. Reference in Numerical Order

-d0.15 switch

sendmail, 6.3.3. Testing the New Delivery Agent Definitions
sendmail, 37.5. Reference in Numerical Order

-d0.4 switch

sendmail, 31.7.1. Macros and the System Identity
sendmail, 37.5. Reference in Numerical Order

-d21.12 switch

sendmail, 10.5. Details of Rule Flow
sendmail, 37.5. Reference in Numerical Order

-d35.9 switch

sendmail, 7.3. Predefined Macros
sendmail, 37.5. Reference in Numerical Order

-d37.1 switch

sendmail, 13.3. Testing the Options
sendmail, 37.5. Reference in Numerical Order

with rule testing : sendmail, 38.7. Add Debugging for Detail

D= equate : sendmail, 30.4. The Equates

DAC (Discretionary Access Controls) : Practical UNIX & Internet Security, 4.1.3. Groups and Group Identifiers (GIDs)

daemon

TCP/IP Network Administration, 3.2. The Host Table

TCP/IP Network Administration, 5.4. The Internet Daemon

options for : sendmail, 34.8. Alphabetized Reference

preventing from running : sendmail, 15.5. Prevent the Daemon from Running

privacy of : sendmail, 34.8. Alphabetized Reference

signals : sendmail, 26.3. Signaling the Daemon

tools for : Building Internet Firewalls, B.5. Daemons

user

Practical UNIX & Internet Security, 4.1. Users and Groups
sendmail, 14.6. Trusted User
TCP/IP Network Administration, 5.4. The Internet Daemon

daemon mode

sendmail, 3.4. Role as a Daemon
sendmail, 4.1.1. Daemon Mode (-bd)
sendmail, 36.7. Alphabetized Reference

DaemonPortOptions (O) option : sendmail, 34.8. Alphabetized Reference

damage, liability for : Practical UNIX & Internet Security, 26.4.6. Liability for Damage

"dangerous write permissions" warning : sendmail, 22.5.1. Dangerous Write Permissions

dash (hyphen)

in machine conversation : sendmail, 4.2. Verbose (-v)
non-equivalent host : TCP/IP Network Administration, 12.2.5. Secure the r Commands

DAT (Digital Audio Tape) : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure

data : Building Internet Firewalls, 1.1.1. Your Data

assigning owners to : Practical UNIX & Internet Security, 2.4.4.1. Assign an owner

availability of : Practical UNIX & Internet Security, 2.1. Planning Your Security Needs

communication equipment (DCE) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol

communications model : TCP/IP Network Administration, 1.2. A Data Communications Model

communications protocols : (see TCP/IP services)

compression, not provided in SLIP : TCP/IP Network Administration, 6.2.1. The Serial Protocols

confidential

Practical UNIX & Internet Security, 2.1. Planning Your Security Needs
Practical UNIX & Internet Security, 2.5.2. Confidential Information

disclosure of : Practical UNIX & Internet Security, 11.2. Damage

DNS

Building Internet Firewalls, 8.10.3. DNS Data
Building Internet Firewalls, 8.10.4.2. Mismatched data between the hostname

espionage

Building Internet Firewalls, 1.2.2.4. Spies (Industrial and
Practical UNIX & Internet Security, 11.3. Authors

giving away with NIS : Practical UNIX & Internet Security, 19.4.5. Unintended Disclosure of Site Information with NIS

identifying assets : Practical UNIX & Internet Security, 2.2.1.1. Identifying assets

protecting from sniffers : Building Internet Firewalls, 10.1.2. Packet Sniffing

spoofing : Practical UNIX & Internet Security, 16.3. IP Security

terminal equipment (DTE) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol

theft of : (see information, theft and espionage)

transferring

Building Internet Firewalls, 6. Packet Filtering
(see email; files, transferring)
allowing/disallowing : Building Internet Firewalls, 6.1. Why Packet Filtering?
via TCP : Building Internet Firewalls, 6.3.3.1. TCP

user-specified, and proxying : Building Internet Firewalls, 7.4.4. User-Specified Data

Data Carrier Detect (DCD) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol

DATA command, in SMTP : TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol

Data Defense Network (DDN) : Practical UNIX & Internet Security, F.3.4.20. MILNET

Data Encryption Standard : (see DES)

DATA keyword : sendmail, 4.2. Verbose (-v)

Data Link Layer

TCP/IP Network Administration, 1.2. A Data Communications Model
TCP/IP Network Administration, 5.3.1.2. Pseudo-device
TCP/IP Network Administration, 6.1.1. Determining the Interface Name
in PPP : TCP/IP Network Administration, 6.2.1. The Serial Protocols

Data Set Ready (DSR) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol

Data Terminal Ready (DTR)

Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol
TCP/IP Network Administration, A.2. The PPP Daemon

data terminology : TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture

data-driven attacks : Building Internet Firewalls, 8.1. Electronic Mail

database files : Practical UNIX & Internet Security, 1.2. What Is an Operating System?

database macros : sendmail, 33. Database Macros

databases : (see networks and networking, databases, network)

classes for : sendmail, 33.8. Alphabetized Reference

external (keyed)

sendmail, 5.3.11. Keyed Databases
sendmail, 20.3. Alphabetized V8.8 Subroutines

K command types : sendmail, 33.3.2. The class

library support : sendmail, 18.4.1. DBMDEF=

m4 and : sendmail, 33.6. Database Maps and m4

/map rule-testing command : sendmail, 38.5.3. Look up a Database Item with /map

sendmail : TCP/IP Network Administration, 10.6.2.1. Transforming with a database

User Database

sendmail, 33.5. The User Database
sendmail, 33.8. Alphabetized Reference
sendmail, 34.8. Alphabetized Reference

datagrams

Building Internet Firewalls, C.5.1.1. The datagram

TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture

TCP/IP Network Administration, 1.5.1.1. The datagram

TCP/IP Network Administration, 1.7. Application Layer

(see also IP datagrams)

(see also User Datagram Protocol)

connectionless delivery of : TCP/IP Network Administration, 1.6. Transport Layer

converting source address of : TCP/IP Network Administration, 4.2.1. Obtaining an IP Address

forwarding : TCP/IP Network Administration, 5.3.1.1. Options

fragmented

Building Internet Firewalls, C.5.1.3. Fragmenting datagrams
TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams
TCP/IP Network Administration, 5.2. Linux Kernel Configuration

headers

TCP/IP Network Administration, 2.7.1. Protocol Numbers
TCP/IP Network Administration, 2.7.2. Port Numbers

marking end of : TCP/IP Network Administration, 6.2.1. The Serial Protocols

routing : TCP/IP Network Administration, 1.5.1.2. Routing datagrams

silently discarding : TCP/IP Network Administration, 11.8. Protocol Case Study

date : (see time and date)

date command

Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command
Practical UNIX & Internet Security, 24.5.1. Never Trust Anything Except Hardcopy

"Date:" header line

sendmail, 1.5. The Header
sendmail, 14.2.2. The Date: Header
sendmail, 30.8. Alphabetized F= Flags
sendmail, 35.10. Alphabetized Reference

day-zero backups : Practical UNIX & Internet Security, 7.1.3. Types of Backups

db library package

sendmail, 2.4.1. Eliminate or Keep db Support?
sendmail, 18.8. Alphabetized Reference
sendmail, C.1. Overview
compiling and installing : sendmail, C.3. Compile and Install

dbm database : sendmail, 33.8. Alphabetized Reference

alias file and

sendmail, 22.6.1. The Alias Database Files
sendmail, 24.5. The Aliases Database

dbx debugger : Practical UNIX & Internet Security, C.4. The kill Command

DCC (Direct Client Connections) : Building Internet Firewalls, 8.9.2. Internet Relay Chat

DCD (Data Carrier Detect) modem control line : TCP/IP Network Administration, A.2. The PPP Daemon

DCE (data communication equipment) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol

DCE (Distributed Computing Environment)

Practical UNIX & Internet Security, 3.2.2. The /etc/passwd File
Practical UNIX & Internet Security, 8.7.3. Code Books
Practical UNIX & Internet Security, 16.2.6.2. Other naming services
Practical UNIX & Internet Security, 19.2. Sun's Remote Procedure Call (RPC)
Practical UNIX & Internet Security, 19.7.1. DCE

dd command

Practical UNIX & Internet Security, 6.6.1.2. Ways of improving the security of crypt
Practical UNIX & Internet Security, 7.4.1. Simple Local Copies

DDN (Data Defense Network)

Building Internet Firewalls, C.10. Internet Routing Architecture
Practical UNIX & Internet Security, F.3.4.20. MILNET
TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information
Protocol Handbook : TCP/IP Network Administration, 1.3. TCP/IP Protocol Architecture

deadlock : Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

debug command

Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
sendmail, 22.3.1. SMTP debug

debug_dumpstate rule set : sendmail, 26.3.3.3. -- ruleset debug_dumpstate returns stat ..., pv: --

debugfs command : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks

debugging

Building Internet Firewalls, 6.1.2.1. Current filtering tools are not perfect

sendmail, 4.3. Debugging (-d)

sendmail, 6.3.3. Testing the New Delivery Agent Definitions

sendmail, 37.2. Debugging Behavior

TCP/IP Network Administration, 8.2.1. The Resolver Configuration File

TCP/IP Network Administration, C.1.1. Signal Processing

(see also bugs)

(see also -d switch (sendmail))

(see also testing)

(see also troubleshooting)

operating system : Building Internet Firewalls, 5.8.1.2. Fix all known system bugs

with rule testing : sendmail, 38.7. Add Debugging for Detail

SMTPDEBUG macro

sendmail, 18.8. Alphabetized Reference
sendmail, 22.3.1. SMTP debug

debugging mode : sendmail, 36.7. Alphabetized Reference

DEC (Digital Equipment Corporation) : Practical UNIX & Internet Security, F.3.4.9. DEC (Digital Equipment Corporation)

decentralizing management : TCP/IP Network Administration, 2.3. Subnets

declaring

classes

sendmail, 12.1.1. Declaring a Class
sendmail, 32.1. Class Configuration Commands

delivery agents : sendmail, 19.3.2. MAILER()

macros

sendmail, 7.2. Defining Macros
sendmail, 31.2. Command-Line Definitions

sites for SITECONFIG : sendmail, 19.6. Alphabetized m4 Macros

trusted users : (see T configuration command)

DECnet network

Practical UNIX & Internet Security, 16.4.3. DECnet
sendmail, 3.3.3. Other Protocols
$C macro : sendmail, 31.10. Alphabetized Reference

DECNET-RELAY macro (m4) : sendmail, 19.6. Alphabetized m4 Macros

decode alias

Practical UNIX & Internet Security, 17.3.4.2. Using sendmail to receive email
sendmail, 22.6. The Aliases File

decryption

TCP/IP Network Administration, 12.6. Encryption
(see encryption)

dedicated connections

TCP/IP Network Administration, 6.3.1. The PPP Daemon
TCP/IP Network Administration, 6.4. Installing SLIP

dedicated proxy servers : Building Internet Firewalls, 7.3.2. Generic Versus Dedicated Proxies

defamation : Practical UNIX & Internet Security, 26.4.7. Harassment, Threatening Communication, and Defamation

default

accounts : Practical UNIX & Internet Security, 8.1.2. Default Accounts

canonicalization : sendmail, 28.6.6.2. Default in canonicalization: $:

character set : sendmail, 30.4. The Equates

content-type character set : sendmail, 34.8. Alphabetized Reference

database key : sendmail, 33.4.1. Specify a Default with $:

delivery agent : sendmail, 34.8. Alphabetized Reference

delivery mode : sendmail, 13.2.3. The Default Delivery Mode

deny : Practical UNIX & Internet Security, 21.1.1. Default Permit vs. Default Deny

domain

Practical UNIX & Internet Security, 16.2.3. Hostnames
TCP/IP Network Administration, 3.3.3. Domain Names
TCP/IP Network Administration, 8.2.1. The Resolver Configuration File
how used : TCP/IP Network Administration, 3.3.3. Domain Names

file permissions : sendmail, 13.2.4. The Default File Permissions

gateway

TCP/IP Network Administration, 2.5. The Routing Table
TCP/IP Network Administration, 4.3. Planning Routing
address : TCP/IP Network Administration, 4. Getting Started

hostname : sendmail, 33.5.3. A :default Outgoing Hostname

logging level : sendmail, 13.2.6. The Default Logging Level

macro definitions : sendmail, 7.3. Predefined Macros

mask : TCP/IP Network Administration, 2.2.2. Classless IP Addresses

passwords : TCP/IP Network Administration, 12.2. User Authentication

permit : Practical UNIX & Internet Security, 21.1.1. Default Permit vs. Default Deny

route

TCP/IP Network Administration, 2.2.2.1. Final notes on IP addresses
TCP/IP Network Administration, 2.5. The Routing Table
TCP/IP Network Administration, 7.3. Building a Static Routing Table
defining : TCP/IP Network Administration, 7.4.1.1. Running RIP with routed

sender's address format : sendmail, 31.10. Alphabetized Reference

User Database location : sendmail, 18.8. Alphabetized Reference

user identity

sendmail, 13.2.5. The Default User Identities
sendmail, 22.8.3.1. The DefaultUser option
sendmail, 34.8. Alphabetized Reference

values : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

default deny stance

Building Internet Firewalls, 3.5.1. Default Deny Stance: That Which Is Not
Building Internet Firewalls, 6.2.3. Default Permit Versus Default Deny

default permit stance

Building Internet Firewalls, 3.5.2. Default Permit Stance: That Which Is
Building Internet Firewalls, 6.2.3. Default Permit Versus Default Deny

DefaultCharSet option : sendmail, 34.8. Alphabetized Reference

defaultdomain file : TCP/IP Network Administration, 9.3. Network Information Service

defaultroute option : TCP/IP Network Administration, 6.3.1. The PPP Daemon

DefaultUser (u,g) option

sendmail, 13.2.5. The Default User Identities
sendmail, 22.8.3.1. The DefaultUser option
sendmail, 34.8. Alphabetized Reference

Defense Communications Agency (DCA) : TCP/IP Network Administration, 1.1. TCP/IP and the Internet

Defense Data Network (DDN) : Building Internet Firewalls, C.10. Internet Routing Architecture

defense in depth

Building Internet Firewalls, 3.2. Defense in Depth
Building Internet Firewalls, 9.2.3.2. Defense in depth

define() : sendmail, 20.3. Alphabetized V8.8 Subroutines

define macro (in sendmail)

TCP/IP Network Administration, E.3. m4 sendmail Macros
TCP/IP Network Administration, E.3.1. define

define statements (m4)

sendmail, 19.1. The m4 Preprocessor
sendmail, 19.4.1. Options

defining

headers : (see H configuration command)

macros

sendmail, 20.3. Alphabetized V8.8 Subroutines
sendmail, 34.8. Alphabetized Reference
sendmail, 36.7. Alphabetized Reference
sendmail, 38.2.1. Define a Macro with .D

definition statements (in gated) : TCP/IP Network Administration, B.7. Definition Statements

delay= equate (syslog output) : sendmail, 26.1.3.2. delay= total time to deliver

delay, transaction : sendmail, 26.1.3.13. xdelay= transaction

delays, inserting

TCP/IP Network Administration, 6.3.2. Dial-Up PPP
TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections

DELETE key : Practical UNIX & Internet Security, 3.4. Changing Your Password

deleting

destructive attack via : Practical UNIX & Internet Security, 25.1. Destructive Attacks
files : Practical UNIX & Internet Security, 5.4. Using Directory Permissions
header lines : sendmail, 20.3. Alphabetized V8.8 Subroutines

delimiters

database key column : sendmail, 33.3.4.12. -z specify the column delimiter (V8.7 and above)

tokens

sendmail, 31.10. Alphabetized Reference
sendmail, 34.8. Alphabetized Reference

"Delivered-To:" header line : sendmail, 35.10. Alphabetized Reference

delivermail program : sendmail, History

delivery

sendmail, 19.6. Alphabetized m4 Macros

(see also users)

alias, forms of : sendmail, 24.2. Forms of Alias Delivery

failure count : sendmail, 23.9. The qf File Internals

via FAX machine : sendmail, 3.3.3. Other Protocols

to files : (see appending to files)

local

sendmail, 3.2. Role in Local Delivery
sendmail, 29.6.3. Delivering to Local Recipient
sendmail, 30.8. Alphabetized F= Flags
(see local)

looking up addresses with DNS : sendmail, 21.2.3. Look Up Addresses for Delivery

to mailbox : sendmail, 3.2.1. Delivery to a Mailbox

to multiple recipients : sendmail, 30.8. Alphabetized F= Flags

path of : (see "Received:" header line)

precedence : (see priority, message)

to programs

sendmail, 3.2.2. Delivery Through a Program
sendmail, 24.2.3. Delivery via Programs
sendmail, 25.7.4. Piping Through Programs
sendmail, 30.8. Alphabetized F= Flags

relays : (see relays)

single threaded : sendmail, 34.8. Alphabetized Reference

total time for : sendmail, 26.1.3.2. delay= total time to deliver

delivery agents (MTAs)

Building Internet Firewalls, 8.1. Electronic Mail

sendmail, 1.1. MUA Versus MTA

sendmail, 5.3.1. Mail Delivery Agents

sendmail, 6.2. Define a Mail Delivery Agent

sendmail, 30. Delivery Agents

(see also M configuration command)

$# operator and

sendmail, 9.2.1. The Delivery Agent ($#)
sendmail, 28.6.5. Specify a Delivery Agent: $#

advantages to sendmail : sendmail, 18.1. To Use or Not to Use

choosing

sendmail, 9. Rule Set 0
sendmail, 9.5. Things to Try

declaring : sendmail, 19.3.2. MAILER()

default : sendmail, 34.8. Alphabetized Reference

equates for : sendmail, 30.4. The Equates

for errors : sendmail, 9.4. The error Delivery Agent

expensive

sendmail, 23.6.1. Periodically with -q
sendmail, 30.8. Alphabetized F= Flags
sendmail, 34.8. Alphabetized Reference

flags

sendmail, 6.3. The local Delivery Agent
sendmail, 6.4. Add the Missing Parts to Mhub
sendmail, 14.2. Headers Versus Delivery Agent Flags
sendmail, 30.8. Alphabetized F= Flags
sendmail, 35.4. ?flags? in Header Definitions

ignoring MX records : sendmail, 21.3.5. What? They Ignore MX Records?

local

sendmail, 6.3. The local Delivery Agent
sendmail, 19.6. Alphabetized m4 Macros

logging : sendmail, 26.1.3.4. mailer= the delivery agent used

printing list of : sendmail, 38.4.2. Show Delivery Agents with =M

as recipients : sendmail, 30.8. Alphabetized F= Flags

scripts via : sendmail, 24.3. Write a Delivery Agent Script

statistics : (see statistics)

symbolic name : sendmail, 30.2. The Symbolic Name

testing : sendmail, 38.5.6. Try a Delivery Agent with /try

UUCP : sendmail, 19.4.6. UUCP

delivery mode : sendmail, 13.2.3. The Default Delivery Mode

delivery program : sendmail, 25.7.5.1. The deliver program

Delivery Status Notification : (see DSN)

DeliveryMode (d) option

sendmail, 13.2.3. The Default Delivery Mode
sendmail, 23.6.1. Periodically with -q
sendmail, 34.8. Alphabetized Reference

Demilitarized Zone (DMZ) : Building Internet Firewalls, 4.1. Some Firewall Definitions

demo accounts : Practical UNIX & Internet Security, 8.1.2. Default Accounts

demultiplexing : TCP/IP Network Administration, 2.7. Protocols, Ports, and Sockets

denial of service

Building Internet Firewalls, 1.2.1.2. Denial of Service

Practical UNIX & Internet Security, 1.5. Role of This Book

Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program

Practical UNIX & Internet Security, 17.3.21.5. Denial of service attacks under X

Practical UNIX & Internet Security, 25. Denial of Service Attacks and Solutions

Practical UNIX & Internet Security, 25.3. Network Denial of Service Attacks

Practical UNIX & Internet Security, 25.3.4. Clogging

TCP/IP Network Administration, 12.1.1. Assessing the Threat

accidental

Building Internet Firewalls, 1.2.3. Stupidity and Accidents
Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial

automatic lockout : Practical UNIX & Internet Security, 3.3. Entering Your Password

checklist for : Practical UNIX & Internet Security, A.1.1.24. Chapter 25: Denial of Service Attacks and Solutions

destructive attacks : Practical UNIX & Internet Security, 25.1. Destructive Attacks

disk attacks

Practical UNIX & Internet Security, 25.2.2. Disk Attacks
Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks

inodes : Practical UNIX & Internet Security, 25.2.2.3. Inode problems

internal inetd services : Practical UNIX & Internet Security, 17.1.3. The /etc/inetd Program

on networks

Practical UNIX & Internet Security, 25.3. Network Denial of Service Attacks
Practical UNIX & Internet Security, 25.3.4. Clogging

overload attacks

Practical UNIX & Internet Security, 25.2. Overload Attacks
Practical UNIX & Internet Security, 25.2.5. Soft Process Limits: Preventing Accidental Denial

via syslog : Practical UNIX & Internet Security, 10.5.1. The syslog.conf Configuration File

system overload attacks : Practical UNIX & Internet Security, 25.2.1.2. System overload attacks

X Window System : Practical UNIX & Internet Security, 17.3.21.5. Denial of service attacks under X

departure of employees : Practical UNIX & Internet Security, 13.2.6. Departure

depository directories, FTP : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP

dequote database

sendmail, 33.8. Alphabetized Reference
TCP/IP Network Administration, 10.7.1. Modifying Local Information

DES (Data Encryption Standard)

Practical UNIX & Internet Security, 6.4.1. Summary of Private Key Systems

Practical UNIX & Internet Security, 6.4.4. DES

Practical UNIX & Internet Security, 6.4.5.2. Triple DES

Practical UNIX & Internet Security, 6.6.2. des: The Data Encryption Standard

Practical UNIX & Internet Security, 7.4.4. Encrypting Your Backups

Practical UNIX & Internet Security, 8.6.1. The crypt()

(see also authentication)

authentication (NIS+) : Practical UNIX & Internet Security, 19.5.4. Using NIS+

improving security of

Practical UNIX & Internet Security, 6.4.5. Improving the Security of DES
Practical UNIX & Internet Security, 6.4.5.2. Triple DES

designated router : TCP/IP Network Administration, 7.4.3. Open Shortest Path First

designing firewalls : Building Internet Firewalls, 1.4.3. Buying Versus Building

destination

TCP/IP Network Administration, 1.7. Application Layer
(see also unreachable destinations, detecting)
fields : TCP/IP Network Administration, 2.5. The Routing Table
host : TCP/IP Network Administration, 2.5. The Routing Table

Destination Address

TCP/IP Network Administration, 1.5.1.1. The datagram
TCP/IP Network Administration, 2.2. The IP Address

Destination Port number

TCP/IP Network Administration, 1.6.1. User Datagram Protocol
TCP/IP Network Administration, 1.6.2. Transmission Control Protocol

destination unreachable codes : (see ICMP)

Destination Unreachable Message : TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol

destroying media : Practical UNIX & Internet Security, 12.3.2.3. Sanitize your media before disposal

destructive attacks : Practical UNIX & Internet Security, 25.1. Destructive Attacks

detached signatures : Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures

detail data, DSN delivery : sendmail, 30.5.2.1. The $@ dsn part

detectors

cable tampering : Practical UNIX & Internet Security, 12.3.1.1. Wiretapping
carbon-monoxide : Practical UNIX & Internet Security, 12.2.1.2. Smoke
humidity : Practical UNIX & Internet Security, 12.2.1.11. Humidity
logging alarm systems : Practical UNIX & Internet Security, 10.7.1.1. Exception and activity reports
smoke : Practical UNIX & Internet Security, 12.2.1.2. Smoke
temperature alarms : Practical UNIX & Internet Security, 12.2.1.6. Temperature extremes
water sensors : Practical UNIX & Internet Security, 12.2.1.12. Water

Deutsches Forschungsnetz : Practical UNIX & Internet Security, F.3.4.14. Germany: DFN-WiNet Internet sites

/dev directory

Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer

TCP/IP Network Administration, 6.4.4. Troubleshooting Serial Connections

/dev/audio device : Practical UNIX & Internet Security, 23.8. Picking a Random Seed

/dev/console device : Practical UNIX & Internet Security, 5.6. Device Files

/dev/kmem device

Practical UNIX & Internet Security, 5.6. Device Files
Practical UNIX & Internet Security, 11.1.2. Back Doors and Trap Doors
sendmail, 18.8. Alphabetized Reference

/dev/null device

Practical UNIX & Internet Security, 5.6. Device Files
sendmail, 5.2. The Minimal File

/dev/random device : Practical UNIX & Internet Security, 23.7.4. Other random number generators

/dev/swap device : Practical UNIX & Internet Security, 5.5.1. SUID, SGID, and Sticky Bits

/dev/urandom device : Practical UNIX & Internet Security, 23.7.4. Other random number generators

device statement : TCP/IP Network Administration, 5.3.1.3. Devices

devices : Practical UNIX & Internet Security, 5.6. Device Files

managing with SNMP : Practical UNIX & Internet Security, 17.3.15. Simple Network Management Protocol (SNMP) (UDP Ports
modem control : Practical UNIX & Internet Security, 14.5.2. Setting Up the UNIX Device
numbers for : sendmail, 23.9. The qf File Internals

Devices file : Practical UNIX & Internet Security, 14.5.1. Hooking Up a Modem to Your Computer

df -i command : Practical UNIX & Internet Security, 25.2.2.3. Inode problems

df files

sendmail, 3.1.2. The Queue Directory
sendmail, 23.2.2. The Data (Message Body) File: df
sendmail, 23.9. The qf File Internals
inode and device information : sendmail, 23.9. The qf File Internals

dfstab file

TCP/IP Network Administration, 9.1.2.1. The share command
TCP/IP Network Administration, 9.1.5.1. NFS print services

dgram sockets : TCP/IP Network Administration, 5.4. The Internet Daemon

DHCP (Dynamic Host Configuration Protocol)

TCP/IP Network Administration, Preface

TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

interoperability and : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

backwards-compatible : TCP/IP Network Administration, 9.5. DHCP

based on Bootstrap Protocol (BOOTP) : TCP/IP Network Administration, 9.4.2. BOOTP extensions

benefits of : TCP/IP Network Administration, 9.5. DHCP

daemon (dhcpd) : TCP/IP Network Administration, 9.5.1. dhcpd.conf

command : TCP/IP Network Administration, D.2. The dhcpd Command
compiling : TCP/IP Network Administration, D.1. Compiling dhcpd
configuring : TCP/IP Network Administration, D.3. The dhcpd.conf Configuration File
tools reference : TCP/IP Network Administration, D. A dhcpd Reference
using latest versions of : TCP/IP Network Administration, D. A dhcpd Reference

dhcpd.conf file : TCP/IP Network Administration, 9.5.1. dhcpd.conf

dhcpd.pid file : TCP/IP Network Administration, D.2. The dhcpd Command

options available with : TCP/IP Network Administration, D.3.3. DHCP Options

commonly used : TCP/IP Network Administration, D.3.3.1. Commonly used options
others : TCP/IP Network Administration, D.3.3.2. Other options

diagnostic tools : TCP/IP Network Administration, 11.2. Diagnostic Tools

diagramming the system : Building Internet Firewalls, 13.5.2. Labeling and Diagraming Your System

dial-up connections : TCP/IP Network Administration, 6.3.1. The PPP Daemon

dial-up IP (dip)

TCP/IP Network Administration, 6.3.2. Dial-Up PPP

TCP/IP Network Administration, 6.4.2. Dial-Up IP

script file : TCP/IP Network Administration, A.1.1. The dip Script File

for SLIP : TCP/IP Network Administration, 6.4.2. Dial-Up IP
sample : TCP/IP Network Administration, A.1.1.1. A sample dip script
special variables, listed : TCP/IP Network Administration, A.1.1. The dip Script File

tools reference : TCP/IP Network Administration, A.1. Dial-Up IP

dial-up PPP : TCP/IP Network Administration, 6.3.2. Dial-Up PPP

DialDelay option : sendmail, 34.8. Alphabetized Reference

dictionary attacks

Building Internet Firewalls, 10.3.1. One-Time Passwords
Practical UNIX & Internet Security, 8.6.1. The crypt()
TCP/IP Network Administration, 12.2. User Authentication

Diffie-Hellman key exchange system

Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems
Practical UNIX & Internet Security, 18.6. Dependence on Third Parties
Practical UNIX & Internet Security, 19.3. Secure RPC (AUTH_DES)
breaking key : Practical UNIX & Internet Security, 19.3.4. Limitations of Secure RPC
exponential key exchange : Practical UNIX & Internet Security, 19.3.1. Secure RPC Authentication

dig

TCP/IP Network Administration, 11.2. Diagnostic Tools
TCP/IP Network Administration, 11.3. Testing Basic Connectivity
TCP/IP Network Administration, 11.6.4. dig: An Alternative to nslookup

digest multipart subtype : TCP/IP Network Administration, 3.4.3. Multipurpose Internet Mail Extensions

Digital Audio Tape (DAT) : Practical UNIX & Internet Security, 7.1.4. Guarding Against Media Failure

digital computers : Practical UNIX & Internet Security, 6.1.2. Cryptography and Digital Computers

Digital Equipment Corporation (DEC) : Practical UNIX & Internet Security, F.3.4.9. DEC (Digital Equipment Corporation)

Digital Signature Algorithm : (see DSA)

digital signatures

Practical UNIX & Internet Security, 6.4. Common Cryptographic Algorithms

Practical UNIX & Internet Security, 6.5. Message Digests and Digital Signatures

Practical UNIX & Internet Security, 6.5.5.2. Message authentication codes

Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures

TCP/IP Network Administration, 12.6. Encryption

checksums

Building Internet Firewalls, 5.8.5.3. About checksums for auditing

Practical UNIX & Internet Security, 6.5.5.1. Checksums

Practical UNIX & Internet Security, 9.2.3. Checksums and Signatures

TCP/IP Network Administration, 1.6.2. Transmission Control Protocol

TCP/IP Network Administration, 11.8. Protocol Case Study

keeping secure : Building Internet Firewalls, 13.5.3. Keeping Secured Checksums

recalculating

TCP/IP Network Administration, 4.2.1. Obtaining an IP Address
TCP/IP Network Administration, 5.3.1.1. Options

using Tripwire for : Building Internet Firewalls, 5.8.5.1. Auditing packages

detached signatures : Practical UNIX & Internet Security, 6.6.3.6. PGP detached signatures

with PGP : Practical UNIX & Internet Security, 6.6.3.4. Adding a digital signature to an announcement

Digital UNIX

Practical UNIX & Internet Security, 1.3. History of UNIX
(see also Ultrix)

Dijkstra Shortest Path First (SPF) algorithm : TCP/IP Network Administration, 7.4.3. Open Shortest Path First

dip (dial-up IP)

TCP/IP Network Administration, 6.3.2. Dial-Up PPP

TCP/IP Network Administration, 6.4.2. Dial-Up IP

script file : TCP/IP Network Administration, A.1.1. The dip Script File

for SLIP : TCP/IP Network Administration, 6.4.2. Dial-Up IP
sample : TCP/IP Network Administration, A.1.1.1. A sample dip script

tools reference : TCP/IP Network Administration, A.1. Dial-Up IP

diphosts file : TCP/IP Network Administration, 6.4.3. SLIP Server Configuration

diplogin command : TCP/IP Network Administration, 6.4.3. SLIP Server Configuration

Direct Client Connections (DCC) : Building Internet Firewalls, 8.9.2. Internet Relay Chat

direct delivery : TCP/IP Network Administration, 3.4.1. Simple Mail Transfer Protocol

directive statements (in gated) : TCP/IP Network Administration, B.3. Directive Statements

directives, Makefile : sendmail, 18.4. Tuning Makefile

directories

Practical UNIX & Internet Security, 5.1.1. Directories

Practical UNIX & Internet Security, 5.1.3. Current Directory and Paths

ancestor : Practical UNIX & Internet Security, 9.2.2.2. Ancestor directories

backing up by : Practical UNIX & Internet Security, 7.1.3. Types of Backups

CDFs (context-dependent files) : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories

cf : sendmail, 16.1. The cf/cf Directory

checklist for : Practical UNIX & Internet Security, A.1.1.4. Chapter 5: The UNIX Filesystem

dot, dot-dot, and / : Practical UNIX & Internet Security, 5.1.1. Directories

FTP depositories : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP

immutable : Practical UNIX & Internet Security, 9.1.1. Immutable and Append-Only Files

listing automatically (Web) : Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues

mounted

Practical UNIX & Internet Security, 5.5.5. Turning Off SUID and SGID in Mounted Filesystems
Practical UNIX & Internet Security, 19.3.2.5. Mounting a secure filesystem

nested : Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks

NFS : (see NFS)

permissions : Practical UNIX & Internet Security, 5.4. Using Directory Permissions

queue : (see queue directory)

read-only : Practical UNIX & Internet Security, 9.1.2. Read-only Filesystems

recipient's home : sendmail, 31.10. Alphabetized Reference

requirement for mounting : TCP/IP Network Administration, 9.1.3. Mounting Remote Filesystems

restricted

Practical UNIX & Internet Security, 8.1.5. Restricted Filesystem
Practical UNIX & Internet Security, 8.1.5.2. Checking new software

root : (see root directory)

for safe file writes : sendmail, 34.8. Alphabetized Reference

SGI and sticky bits on : Practical UNIX & Internet Security, 5.5.6. SGID and Sticky Bits on Directories

Web server structure of

Practical UNIX & Internet Security, 18.2.2. Understand Your Server's Directory Structure
Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues

world-writable : Practical UNIX & Internet Security, 11.6.1.1. World-writable user files and directories

directory statement : TCP/IP Network Administration, 8.3.1.2. Primary and secondary server configurations

<Directory> blocks

Practical UNIX & Internet Security, 18.3.1. The access.conf and .htaccess Files
Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>
Practical UNIX & Internet Security, 18.3.2.1. Examples

disabling Internet services : Building Internet Firewalls, 5.8.2. Disabling Nonrequired Services

disabling routing : (see routers and routing, disabling)

disasters and disaster recovery

Practical UNIX & Internet Security, 12.2.6.4. Minimizing downtime
sendmail, 21.5. Prepare for Disaster
TCP/IP Network Administration, 11.10. Summary
TCP/IP Network Administration, 12.1.1. Assessing the Threat
TCP/IP Network Administration, 12.1.3. Writing a Security Policy
TCP/IP Network Administration, 12.8. Words to the Wise

disclosure of information, threat of : TCP/IP Network Administration, 12.1.1. Assessing the Threat

disconnecting after incident : Building Internet Firewalls, 13.1.2. Disconnect or Shut Down, as

disconnecting machine : Building Internet Firewalls, 13.4.3. Planning for Disconnecting or

disk attacks

Practical UNIX & Internet Security, 25.2.2. Disk Attacks
Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks

disk quotas : Practical UNIX & Internet Security, 25.2.2.5. Using quotas

disk space : (see memory; resources)

diskettes : (see backups; media)

disks, needs for : Building Internet Firewalls, 5.3.3. What Hardware Configuration?

dismissed employees : Practical UNIX & Internet Security, 13.2.6. Departure

dismounting directories, by booting : TCP/IP Network Administration, 9.1.3.1. The mount command

disposing of materials : Practical UNIX & Internet Security, 12.3.3. Other Media

Distfile : TCP/IP Network Administration, 9.6.1. rdist

distributed

architecture : TCP/IP Network Administration, 7.5.1. Exterior Gateway Protocol
control : TCP/IP Network Administration, 12.1.2. Distributed Control
servers, managing : TCP/IP Network Administration, 9.6. Managing Distributed Servers

Distributed Computing Environment : (see DCE)

Distributed File System (DFS) : TCP/IP Network Administration, 3.7.1. File Sharing

distributing public keys : TCP/IP Network Administration, 12.6. Encryption

diversity of defense systems : Building Internet Firewalls, 3.7. Diversity of Defense

divert command (m4)

sendmail, 19.1.4. m4 diversions
sendmail, 19.6. Alphabetized m4 Macros

dividing problem into manageable pieces : TCP/IP Network Administration, 11.1.1. Troubleshooting Hints

DMBDEF variable : TCP/IP Network Administration, E.4.4. The sendmail K Command

DMBDEF= directive : sendmail, 18.4.1. DBMDEF=

dmesg command : TCP/IP Network Administration, 6.1.1. Determining the Interface Name

DMZ (Demilitarized Zone) : Building Internet Firewalls, 4.1. Some Firewall Definitions

dnl command (m4) : sendmail, 19.1.2. m4 and dnl

DNS (Domain Name Service)

Building Internet Firewalls, 2.9. Name Service

Building Internet Firewalls, 5.6. Selecting Services Provided by the

Practical UNIX & Internet Security, 16.2.6. Name Service

Practical UNIX & Internet Security, 16.2.6.2. Other naming services

Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)

Practical UNIX & Internet Security, 17.3.6.2. DNS nameserver attacks

sendmail, 17.2.1. Is the Host Local?

sendmail, 21.1. Overview

TCP/IP Network Administration, 1.7. Application Layer

TCP/IP Network Administration, 3.1. Names and Addresses

TCP/IP Network Administration, 3.3. Domain Name Service

(see also name service)

benefits of

TCP/IP Network Administration, 3.3. Domain Name Service
TCP/IP Network Administration, 3.3.4. BIND, resolver, and named

bestmx_is_local feature : sendmail, 19.6. Alphabetized m4 Macros

configuring : Building Internet Firewalls, 8.10. Domain Name System

in screened host architecture : Building Internet Firewalls, 9.2.1.6. DNS
in screened subnet architecture : Building Internet Firewalls, 9.1.1.6. DNS
without hiding information : Building Internet Firewalls, 8.10.6. Setting up DNS Without Hiding

data : Building Internet Firewalls, 8.10.3. DNS Data

disasters : sendmail, 21.5. Prepare for Disaster

eliminating support for : sendmail, 2.4.2. Eliminate DNS Support

error numbers : sendmail, B.1. Status file lines

fake server : Building Internet Firewalls, 8.10.5.1. Set up a `fake'

hiding information with : Building Internet Firewalls, 8.10.5. Setting Up DNS to Hide

MX records

Building Internet Firewalls, 8.10.5.1. Set up a `fake'
Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
sendmail, 15.3. MX Records
sendmail, 18.8. Alphabetized Reference
sendmail, 21.3. Set Up MX Records
sendmail, 34.8. Alphabetized Reference
sendmail, 38.5.2. Look Up MX Records with /mx
TCP/IP Network Administration, 8.3.2. Standard Resource Records
TCP/IP Network Administration, 8.3.6. The named.hosts File
TCP/IP Network Administration, 8.4. Using nslookup
TCP/IP Network Administration, 10.7.1. Modifying Local Information
TCP/IP Network Administration, C.3.1.4. Mail exchanger record
0 flag : sendmail, 30.8. Alphabetized F= Flags
bestmx database class : sendmail, 33.8. Alphabetized Reference
bestmx_is_local feature : sendmail, 19.6. Alphabetized m4 Macros
fallback MX host : sendmail, 34.8. Alphabetized Reference
ignored by delivery agents : sendmail, 21.3.5. What? They Ignore MX Records?
looking up for addresses : sendmail, 21.2.3. Look Up Addresses for Delivery
offsite hosts : sendmail, 21.5.1. Offsite MX Hosts
with wildcards : sendmail, 21.3.4. Wildcard MX Records

nameserver attacks : Practical UNIX & Internet Security, 17.3.6.2. DNS nameserver attacks

omitting support : sendmail, 19.6. Alphabetized m4 Macros

querying : TCP/IP Network Administration, 10.7.1. Modifying Local Information

resource on : sendmail, Other Books, Other Problems

revealing information to attackers : Building Internet Firewalls, 8.10.4.3. Revealing too much information to

rogue servers : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice

security and : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice

server for internal hosts : Building Internet Firewalls, 8.10.5.2. Set up a real DNS

starting : TCP/IP Network Administration, 5.4. The Internet Daemon

tuning lookups : sendmail, 34.8. Alphabetized Reference

zone transfers

Practical UNIX & Internet Security, 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53)
Practical UNIX & Internet Security, 17.3.6.1. DNS zone transfers

docs/warnings file : TCP/IP Network Administration, 12.4.3.1. COPS

documentation

Practical UNIX & Internet Security, 2.5. The Problem with Security Through Obscurity

Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs

historical, of problems : TCP/IP Network Administration, 11.1.1. Troubleshooting Hints

incidents : Building Internet Firewalls, 13.1.7. Document the Incident

plan for : Building Internet Firewalls, 13.4.7. Planning for Documentation

sendmail

sendmail, Additional Sources of Information
sendmail, 2.2. Read the Documents

system after incident

Building Internet Firewalls, 13.1.5. Snapshot the System
Building Internet Firewalls, 13.4.5. Planning for Snapshots

using : TCP/IP Network Administration, 4.6. Informing the Users

dollar sign ($)

$ line (qf file) : sendmail, 23.9. The qf File Internals

$ rule-testing command : sendmail, 38.3.1. Dump a Defined Macro with $

in macro names : sendmail, 31.5. Macro Expansion: $ and $&

wildcard operators

sendmail, 8.7. Wildcard Operators
(see also wildcard operators)

$1, $2, ... : (see positional operators)

$&

sendmail, 28.6.4. Rewrite Through Another Rule Set: $>set
sendmail, 31.5.3. Use Value as Is with $&

$> : sendmail, 28.6.4. Rewrite Through Another Rule Set: $>set

$* : sendmail, 10.2.1. The LHS

$@

sendmail, 9.2.2. The Host ($@)
sendmail, 9.3. Testing Rule Set 0
sendmail, 11.4.1. Rewrite the Lone Username
sendmail, 17.1.1.3. Handle null address
sendmail, 28.6.3. Rewrite-and-Return Prefix: $@
sendmail, 30.5.2.1. The $@ dsn part
sendmail, 33.4.2. Specify Numbered Substitution with $@

$[ and $]

sendmail, 19.6. Alphabetized m4 Macros
sendmail, 21.2.4. The $[ and $] Operators
sendmail, 28.6.6. Canonicalize Hostname: $[ and $]
sendmail, 33.4.3. $[ and $]: A Special Case

$:

sendmail, 9.2.3. The User ($:)
sendmail, 9.3. Testing Rule Set 0
sendmail, 28.6.2. Rewrite Once Prefix: $:
sendmail, 29.6.1. Further Processing: $:user
sendmail, 30.5.3. The $: Part
sendmail, 33.4.1. Specify a Default with $:
sendmail, 33.4. Use Maps with $( and $) in Rules

$.

sendmail, 14.1.3. Testing So Far
sendmail, 31.6. Macro Conditionals: $?, $|, and $.

$=

sendmail, 12.1. The Class Command
sendmail, 32.2.1. Matching Any in a Class: $=
sendmail, 38.3.2. Dump a Class Macro with $=

$#

sendmail, 9.2.1. The Delivery Agent ($#)
sendmail, 28.6.5. Specify a Delivery Agent: $#

$- : sendmail, 11.4.1. Rewrite the Lone Username

$( and $) : sendmail, 33.4. Use Maps with $( and $) in Rules

$+ : sendmail, 8.7. Wildcard Operators

$?

sendmail, 14.1.3. Testing So Far
sendmail, 31.6. Macro Conditionals: $?, $|, and $.

$~ : sendmail, 32.2.2. Matching Any Not in a Class: $~

$| : sendmail, 31.6. Macro Conditionals: $?, $|, and $.

$_ macro

sendmail, 20.2.4. Verify identd Information
sendmail, 23.9. The qf File Internals
sendmail, 26.1.3.9. relay= the host that sent or accepted the message
sendmail, 31.10. Alphabetized Reference

DOL macro (m4) : sendmail, 19.6. Alphabetized m4 Macros

DOMAIN() : sendmail, 19.3.3. DOMAIN()

DOMAIN macro (in sendmail) : TCP/IP Network Administration, E.3. m4 sendmail Macros

Domain Name Pointer records : (see PTR resource records)

Domain Name Service : (see DNS)

domain names

Practical UNIX & Internet Security, 16.2.3. Hostnames
sendmail, 8.1. A Fictional Network
sendmail, 19.6. Alphabetized m4 Macros
sendmail, 31.10. Alphabetized Reference
TCP/IP Network Administration, 3.3.3. Domain Names
TCP/IP Network Administration, 4. Getting Started
application form : TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
fully qualified : TCP/IP Network Administration, 3.3.3. Domain Names
in NIS : TCP/IP Network Administration, 9.3. Network Information Service
obtaining : TCP/IP Network Administration, 4.4.1. Obtaining a Domain Name
parameter : TCP/IP Network Administration, 9.4. A BOOTP Server

DOMAIN source file (in sendmail)

TCP/IP Network Administration, E.3.2. FEATURE
TCP/IP Network Administration, E.3.4. DOMAIN
mail relay defines, listed : TCP/IP Network Administration, E.3.4. DOMAIN

domain-type addresses : sendmail, 17.1.3. Internet Addresses

domain/named.root : TCP/IP Network Administration, 11.6.3. Cache corruption

domainname command

Practical UNIX & Internet Security, 19.4.3. NIS Domains
TCP/IP Network Administration, 9.3. Network Information Service

domains

Practical UNIX & Internet Security, 19.4.3. NIS Domains

TCP/IP Network Administration, 1.7. Application Layer

accepting only internal mail : sendmail, 20.2.1. Accept Mail Only From Our Domain

adding to recipient address : sendmail, 30.8. Alphabetized F= Flags

administration

TCP/IP Network Administration, 3.3.4. BIND, resolver, and named
TCP/IP Network Administration, 8.1. BIND: UNIX Name Service
contacting : TCP/IP Network Administration, 13.6. The White Pages

allocating : (see Network Information Center)

always_add_domain feature : sendmail, 19.6. Alphabetized m4 Macros

creating : TCP/IP Network Administration, 3.3.2. Creating Domains and Subdomains

downloading an entire : TCP/IP Network Administration, 8.4. Using nslookup

entry, in resolv.conf : TCP/IP Network Administration, 8.2.1. The Resolver Configuration File

FQDN : (see FQDNs)

hierarchy

TCP/IP Network Administration, 3.3.1. The Domain Hierarchy
TCP/IP Network Administration, 8.1. BIND: UNIX Name Service

list of local : sendmail, 32.5. Alphabetized Reference

masquerading : sendmail, 19.6. Alphabetized m4 Macros

name servers : TCP/IP Network Administration, 4.2.1.1. Assigning host addresses

parameter : TCP/IP Network Administration, 9.4. A BOOTP Server

organizational : TCP/IP Network Administration, 3.3.1. The Domain Hierarchy

part of hostname : (see $m macro)

virtual, mapping to addresses : sendmail, 19.6. Alphabetized m4 Macros

domaintable database

TCP/IP Network Administration, 10.7.1. Modifying Local Information
sendmail, 19.6. Alphabetized m4 Macros

DontExpandCNames option : sendmail, 34.8. Alphabetized Reference

DontInitGroups option : sendmail, 34.8. Alphabetized Reference

DontPruneRoutes command : sendmail, 34.8. Alphabetized Reference

dormant accounts

Practical UNIX & Internet Security, 8.4. Managing Dormant Accounts
Practical UNIX & Internet Security, 8.4.3. Finding Dormant Accounts

dot (.)

. line (qf file) : sendmail, 23.9. The qf File Internals

checking for in ${pd} : sendmail, D.1. Sun Enhancements

for current directory : Practical UNIX & Internet Security, 5.1.1. Directories

to end messages

sendmail, 4.2. Verbose (-v)
sendmail, 30.8. Alphabetized F= Flags

filenames starting with, disabling creation of : Building Internet Firewalls, 8.2.1.6. Be careful of writable

host status file line : sendmail, B.1. Status file lines

leading in messages : sendmail, 34.8. Alphabetized Reference

trailing in FQDNs

sendmail, 15.3. MX Records
sendmail, 17.4. Rule Set 4
sendmail, 29.5.1. Stripping Trailing Dots

.. directory : Practical UNIX & Internet Security, 5.1.1. Directories

.. for domain name : TCP/IP Network Administration, C.3.1. Standard Resource Records

dotted decimal notation : TCP/IP Network Administration, 2.3. Subnets

Double DES : Practical UNIX & Internet Security, 6.4.5. Improving the Security of DES

double quotation marks (")

sendmail, 13.2.8. The Unquoted Space Replacement Character
sendmail, 31.3.2. Syntax of the Configuration File Macro's Text

double-reverse lookups

Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
Building Internet Firewalls, 8.10.4.2. Mismatched data between the hostname
Building Internet Firewalls, 8.10.5.1. Set up a `fake'

DoubleBounceAddress option : sendmail, 34.8. Alphabetized Reference

DOW USA : Practical UNIX & Internet Security, F.3.4.10. DOW USADOW USA

down sites : sendmail, 23.7.1. Handling a Down Site

downloading files : Practical UNIX & Internet Security, 12.3.4. Protecting Local Storage

logging

Practical UNIX & Internet Security, 10.3.3. xferlog Log File
Practical UNIX & Internet Security, 10.3.5. access_log Log File

downtime : Practical UNIX & Internet Security, 12.2.6.4. Minimizing downtime

due to criminal investigations : Practical UNIX & Internet Security, 26.2.4. Hazards of Criminal Prosecution
logging : Practical UNIX & Internet Security, 10.7.2.1. Exception and activity reports

drand48 function : Practical UNIX & Internet Security, 23.7.3. drand48 ( ), lrand48 ( ), and mrand48 ( )

Drawbridge package : Building Internet Firewalls, B.3.2. Drawbridge

drills, security : Practical UNIX & Internet Security, 24.1.3. Rule #3: PLAN AHEAD

drink : Practical UNIX & Internet Security, 12.2.2.1. Food and drink

ds.internic.net : TCP/IP Network Administration, 13.4. Retrieving RFCs

DSA (Digital Signature Algorithm)

Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems
Practical UNIX & Internet Security, 6.5.3. Digital Signatures

DSN (Delivery Status Notification)

sendmail, 6.3. The local Delivery Agent

sendmail, B.1. Status file lines

DSN macro : sendmail, 18.8. Alphabetized Reference

ENVID identifier

sendmail, 23.9. The qf File Internals
sendmail, 36.7. Alphabetized Reference

ORCPT address : sendmail, 23.9. The qf File Internals

original envelope ID : sendmail, 31.10. Alphabetized Reference

types for : (see T= equate)

DTE (data terminal equipment) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol

du command : Practical UNIX & Internet Security, 25.2.2.1. Disk-full attacks

dual-homed hosts

Building Internet Firewalls, 7. Proxy Systems

(see also proxy servers/services)

architecture of : Building Internet Firewalls, 4.2.1. Dual-Homed Host Architecture

with screen subnet architecture : Building Internet Firewalls, 4.3.8. It's OK to Use

as firewall : Building Internet Firewalls, 5.8.2.5. Turning off routing

nonrouting : Building Internet Firewalls, 5.2.1. Nonrouting Dual-homed Hosts

proxy services and : (see proxy servers/services)

dual universes : Practical UNIX & Internet Security, 5.9.1. Dual Universes

ducts, air : Practical UNIX & Internet Security, 12.2.3.2. Entrance through air ducts

dummy interface : TCP/IP Network Administration, 5.2. Linux Kernel Configuration

dump : TCP/IP Network Administration, 7.7.2. Testing the Configuration

dump/restore program

Practical UNIX & Internet Security, 7.1.3. Types of Backups
Practical UNIX & Internet Security, 7.4.3. Specialized Backup Programs
Practical UNIX & Internet Security, 7.4.4. Encrypting Your Backups

dumping macros : sendmail, 38.3. Dump a Macro

dumping state : sendmail, 26.3.3. SIGUSR1 Dump States

dumpster diving : Practical UNIX & Internet Security, 12.3.3. Other Media

duplicate database keys : sendmail, 33.2.1.1. -d allow duplicate keys

duplicate entries in alias file : sendmail, 24.4.4. Duplicate Entries and Automation

duress code : Practical UNIX & Internet Security, 8.7.2. Token Cards

dust : Practical UNIX & Internet Security, 12.2.1.3. Dust

dynamic

assignment of addresses

TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol
TCP/IP Network Administration, 4.2.1.1. Assigning host addresses
automatic under DHCP : TCP/IP Network Administration, 9.5. DHCP
circumstances favoring : TCP/IP Network Administration, 4.3. Planning Routing

packet filtering

Building Internet Firewalls, 6.3.3.2. UDP
Building Internet Firewalls, 8.2.1.1. Packet filtering characteristics of

port allocation : TCP/IP Network Administration, 2.7.3. Sockets

routing

TCP/IP Network Administration, 4.3. Planning Routing
TCP/IP Network Administration, 7.1. Common Routing Configurations

Dynamic DNS : TCP/IP Network Administration, 3.6.1. Dynamic Host Configuration Protocol

Dynamic Host Configuration Protocol : (see DHCP)

dynamic-bootp flag : TCP/IP Network Administration, D.3.2. Configuration Parameters

dynamic-bootp-lease-cutoff parameter : TCP/IP Network Administration, 9.5.1. dhcpd.conf

dynamic-bootp-lease-length parameter : TCP/IP Network Administration, 9.5.1. dhcpd.conf

Search | Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z