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Index: F

in sendmail

TCP/IP Network Administration, E.3. m4 sendmail Macros
TCP/IP Network Administration, E.3.2. FEATURE
features, listed : TCP/IP Network Administration, E.3.2. FEATURE

Federal Information Exchanges (FIXs) : TCP/IP Network Administration, 1.1. TCP/IP and the Internet

Federal Information Processing Standard (FIPS) : Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems

federal law enforcement

Practical UNIX & Internet Security, 26.2.2. Federal Jurisdiction
Practical UNIX & Internet Security, 26.2.3. Federal Computer Crime Laws

fetch-glue substatement

DNS & BIND, 10.9. A Nonrecursive Name Server
DNS & BIND, 10.11.5. Delegated Name Server Configuration

_FFR_ macro : sendmail, 18.8. Alphabetized Reference

FFS (Fast File System) : Practical UNIX & Internet Security, 25.2.2.6. Reserved space

fgetfolded routine : sendmail, 18.8. Alphabetized Reference

fgets function : Practical UNIX & Internet Security, 23.1.1. The Lesson of the Internet Worm

Fiber Digital Data Interface (FDDI)

TCP/IP Network Administration, 1.7. Application Layer
TCP/IP Network Administration, 5.3.1.2. Pseudo-device
(see also FDDI network)

fiber optic cables : (see cables, network)

file channels (logging) : DNS & BIND, 7.5.2.1. File channels

file class macros : sendmail, 5.3.6. File Class Macros

*file* delivery agent : sendmail, 30.5.1. The *file* and *include* Agents

file descriptors

DNS & BIND, 7.6.1. Common Syslog Messages
DNS & BIND, 12.3.1. Name Server Startup (Debug Level 1)

File Handles : Practical UNIX & Internet Security, 20.1.2. File HandlesFile Handles

File Service Protocol

Building Internet Firewalls, 2.2. File Transfer
Building Internet Firewalls, 8.2.3. File Service Protocol (FSP)

File Transfer Protocol : (see FTP (File Transfer Protocol))

filenames, attacks via : Practical UNIX & Internet Security, 11.5.1.4. Filename attacks

files : Practical UNIX & Internet Security, 5.1. Files

appending to

sendmail, 33.2.1.4. -o append to, don't overwrite the file
(see appending to files)

automatic directory listings : Practical UNIX & Internet Security, 18.2.2.2. Additional configuration issues

backing up

Practical UNIX & Internet Security, 7. Backups

Practical UNIX & Internet Security, 7.4.7. inode Modification Times

automatic system for

Practical UNIX & Internet Security, 7.3.2. Building an Automatic Backup System
Practical UNIX & Internet Security, 18.2.3.5. Beware stray CGI scripts

critical files

Practical UNIX & Internet Security, 7.3. Backing Up System Files
Practical UNIX & Internet Security, 7.3.2. Building an Automatic Backup System

prioritizing : Practical UNIX & Internet Security, 7.3.1. What Files to Back Up?

changing owner of : Practical UNIX & Internet Security, 5.7. chown: Changing a File's Owner

checking : TCP/IP Network Administration, 12.4.2.1. Checking files

configuration : (see configuration, files)

context-dependent (CDFs)

Practical UNIX & Internet Security, 5.9.2. Context-Dependent Files
Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories

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

delivery to : sendmail, 30.8. Alphabetized F= Flags

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

detecting changes to

Practical UNIX & Internet Security, 9.2. Detecting Change
Practical UNIX & Internet Security, 9.3. A Final Note

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

directory for safe writes : sendmail, 34.8. Alphabetized Reference

downloading, logs of

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

F configuration command : sendmail, 22.4.2. The F Command - File Form

finding : TCP/IP Network Administration, 13.3. Finding Files

finding all SUID/SGID

Practical UNIX & Internet Security, 5.5.4. Finding All of the SUID and SGID Files
Practical UNIX & Internet Security, 5.5.4.1. The ncheck command

format, monitoring : Practical UNIX & Internet Security, 8.2. Monitoring File Format

group-writable : Practical UNIX & Internet Security, 11.6.1.2. Writable system files and directories

hidden : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories

hidden space : Practical UNIX & Internet Security, 25.2.2.7. Hidden space

history : Practical UNIX & Internet Security, 10.4.1. Shell History

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

integrity of : (see integrity)

intruder's changes to : Practical UNIX & Internet Security, 24.4.1.1. Changes in file contents

locating largest : Practical UNIX & Internet Security, 25.2.2.1. Disk-full attacks

location, sendmail options for : sendmail, 34.6.1. File Locations

lock requests, handling : TCP/IP Network Administration, 9.1.1. NFS Daemons

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

log : (see logs/logging)

mail sent directly to : Practical UNIX & Internet Security, 15.7. Early Security Problems with UUCP

mailbox : (see mailbox file)

of masquerading domains : sendmail, 19.6. Alphabetized m4 Macros

modification times of

Practical UNIX & Internet Security, 5.1.2. Inodes
Practical UNIX & Internet Security, 5.1.5. File Times
Practical UNIX & Internet Security, 7.4.7. inode Modification Times
Practical UNIX & Internet Security, 9.2.2. Checklists and Metadata

network configuration : Practical UNIX & Internet Security, 10.4.3. Network Setup

output, can't write to : sendmail, 36.5.1. EX_CANTCREAT Can't Write a User's File

queue : sendmail, 3.1.2. The Queue Directory

remote access to

Practical UNIX & Internet Security, 15.4.1. USERFILE: Providing Remote File Access
Practical UNIX & Internet Security, 15.4.2.1. Some bad examples

removing from anonymous FTP area : Building Internet Firewalls, 8.2.1.6. Be careful of writable

servers, names of : TCP/IP Network Administration, 4.5.1. File servers

SGID bit on : Practical UNIX & Internet Security, 5.5.7. SGID Bit on Files (System V UNIX Only): Mandatory

sharing

TCP/IP Network Administration, 1.7. Application Layer
TCP/IP Network Administration, 3.7.1. File Sharing
different from file transfer : TCP/IP Network Administration, 3.7.1. File Sharing

in src directory : sendmail, 2.3. What's What in src

startup

Practical UNIX & Internet Security, 11.5.2. Start-up File Attacks
Practical UNIX & Internet Security, 11.5.2.7. Other initializations

storing classes in : sendmail, 12.2. The File Form of Class

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

temporary, permissions for : sendmail, 34.8. Alphabetized Reference

transferring

Building Internet Firewalls, 2.2. File Transfer
Building Internet Firewalls, 8.2. File Transfer
Building Internet Firewalls, 8.14. Network File System
Practical UNIX & Internet Security, 15.1.1. uucp Command
(see also NFS)
interactive transfers : TCP/IP Network Administration, 1.7. Application Layer

types of : Practical UNIX & Internet Security, 5.1.6. Understanding File Permissions

unowned : Practical UNIX & Internet Security, 24.4.1.8. Unowned files

uploading by prearrangement : Building Internet Firewalls, 8.2.1.6. Be careful of writable

on Web servers : (see Web servers)

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

zero-filled bytes in : Practical UNIX & Internet Security, 7.4. Software for Backups

filesystems : (see directories)

backing up : Building Internet Firewalls, 13.5.1. Backing Up Your Filesystems
hierarchy : sendmail, 3.1. Role in the Filesystem
mounting as read-only : Building Internet Firewalls, 5.8.4.3. Mount filesystems as read-only
network : Building Internet Firewalls, 2.12. Network File Systems

filter files (mail) : Practical UNIX & Internet Security, 11.5.2.5. .forward, .procmailrc

filter programs

sendmail, 24.4.1. The Postmaster Alias
sendmail, 24.6.2. Filtering Recipients with a Shell Script

filtering air : Practical UNIX & Internet Security, 12.2.1.3. Dust

filtering packets

DNS & BIND, 15.4.1.1. Packet filters
(see also packet filtering)

filtering router : (see screening routers)

FIN bit : TCP/IP Network Administration, 1.6.2. Transmission Control Protocol

find command

Practical UNIX & Internet Security, 5.5.4. Finding All of the SUID and SGID Files
Practical UNIX & Internet Security, 11.5.1.4. Filename attacks
-H option : Practical UNIX & Internet Security, 5.9.2. Context-Dependent Files
-ls option : Practical UNIX & Internet Security, 9.2.2.1. Simple listing
-size option : Practical UNIX & Internet Security, 25.2.2.1. Disk-full attacks
-H option : Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories
in security checks : TCP/IP Network Administration, 12.4.2.1. Checking files
-print option : Practical UNIX & Internet Security, 5.5.4. Finding All of the SUID and SGID Files
type -f option : Practical UNIX & Internet Security, 5.5.4. Finding All of the SUID and SGID Files
-xdev option : Practical UNIX & Internet Security, 5.5.4. Finding All of the SUID and SGID Files

finding : (see searching)

finding addresses (rule set 3)

sendmail, 10. Rule Set 3
sendmail, 17.1. Rule Set 3
sendmail, 19.6. Alphabetized m4 Macros
sendmail, 29.4. Rule Set 3
sendmail, 38.6.3. Rule 3 Always Called First with -bt

finger service

Building Internet Firewalls, 2.7. Information About People
Building Internet Firewalls, 5.6. Selecting Services Provided by the
Building Internet Firewalls, 5.8.2.4. Which services should you disable?
Building Internet Firewalls, 8.8.1. finger
Practical UNIX & Internet Security, 8.1.3. Accounts That Run a Single Command
Practical UNIX & Internet Security, 10.1.1. lastlog File
Practical UNIX & Internet Security, 10.1.2. utmp and wtmp Files
Practical UNIX & Internet Security, 15.3.1. Assigning Additional UUCP Logins
Practical UNIX & Internet Security, 15.4.3. L.cmds: Providing Remote Command Execution
Practical UNIX & Internet Security, 17.3.4.3. Improving the security of Berkeley sendmail V8
Practical UNIX & Internet Security, 17.3.8. finger (TCP Port 79)
Practical UNIX & Internet Security, 17.3.8.3. Replacing finger
Practical UNIX & Internet Security, 21.4.4.1. Creating an ftpout account to allow FTP without proxies.
Practical UNIX & Internet Security, 23.1.1. The Lesson of the Internet Worm
Practical UNIX & Internet Security, 24.2.1. Catching One in the Act
Practical UNIX & Internet Security, 24.2.4.2. How to contact the system administrator of a computer
(see also Worm program)
disabling : Practical UNIX & Internet Security, 17.3.8.2. Disabling finger
monitoring access to daemon : TCP/IP Network Administration, 12.5.1. wrapper
service : TCP/IP Network Administration, 5.4. The Internet Daemon
target for intruders : TCP/IP Network Administration, C.3.1.8. Well-Known Services record

fingerd server

Building Internet Firewalls, 5.8.2.4. Which services should you disable?
sendmail, 22.3.2. SMTP vrfy and expn

fingerprint authentication : Building Internet Firewalls, 10.2.1. Something You Are

finite state machine (FSM)

diagrams or tables : TCP/IP Network Administration, B.4. Trace Statements
transitions, tracing : TCP/IP Network Administration, B.8.10. The routerdiscovery Statement

FIPS (Federal Information Processing Standard) : Practical UNIX & Internet Security, 6.4.2. Summary of Public Key Systems

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

fires

Practical UNIX & Internet Security, 12.2.1.1. Fire
Practical UNIX & Internet Security, 12.2.1.2. Smoke
Practical UNIX & Internet Security, 12.4.1.1. Fire hazards
TCP/IP Network Administration, 12.1.1. Assessing the Threat
extinguishers and radio transmitters : Practical UNIX & Internet Security, 12.2.1.8. Electrical noise

firewalls

DNS & BIND, 15.4. DNS and Internet Firewalls

Building Internet Firewalls, 1.4. What Is an Internet Firewall?

Practical UNIX & Internet Security, 8.8.9. Account Names Revisited: Using Aliases for Increased

Practical UNIX & Internet Security, 17.2. Controlling Access to Servers

Practical UNIX & Internet Security, 21. Firewalls

Practical UNIX & Internet Security, 21.4.2. Electronic Mail

Practical UNIX & Internet Security, 21.5. Special Considerations

TCP/IP Network Administration, 9.3.2. NIS+

TCP/IP Network Administration, 12.7. Firewalls

(see also security)

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

architecture of : Building Internet Firewalls, 4.2. Firewall Architectures

backing up : Building Internet Firewalls, 12.1.1. Backing Up Your Firewall

blocking troubleshooting measures : TCP/IP Network Administration, 11.1.1. Troubleshooting Hints

buying versus building : Building Internet Firewalls, 1.4.3. Buying Versus Building

checklist for : Practical UNIX & Internet Security, A.1.1.20. Chapter 21: Firewalls

configuring NTP with : Building Internet Firewalls, 8.13.3. Configuring NTP to

configuring SMTP with : Building Internet Firewalls, 8.1.1.6. Configuring SMTP to

defined : TCP/IP Network Administration, 12.7. Firewalls

definition of : Building Internet Firewalls, 1.4. What Is an Internet Firewall?

designing : Building Internet Firewalls, 4. Firewall Design

disadvantage of : TCP/IP Network Administration, 12.7.1. Functions of the firewall

dual-homed host as : Building Internet Firewalls, 5.8.2.5. Turning off routing

FAQ for : Building Internet Firewalls, A.7. Papers

functions of : TCP/IP Network Administration, 12.7.1. Functions of the firewall

headers and : sendmail, 20.2.5. Prune Received: Headers at Firewall

internal : Building Internet Firewalls, 4.4. Internal Firewalls

bastion hosts on : Building Internet Firewalls, 4.4.6. An Internal Firewall May or May Not

IP multicasting and : Building Internet Firewalls, 8.9.3. The Multicast Backbone (MBONE)

IPv6 and : Building Internet Firewalls, 6.3.6. IP Version 6

on joint networks : Building Internet Firewalls, 4.4.4. Joint Venture Firewalls

keeping current : Building Internet Firewalls, 12.3. Keeping Up to Date

layering : Building Internet Firewalls, 3.2. Defense in Depth

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

mailing list for

Practical UNIX & Internet Security, E.1.3.1. Academic-Firewalls
Practical UNIX & Internet Security, E.1.3.7. Firewalls

mailing lists : Building Internet Firewalls, A.3.1. Firewalls

maintaining : Building Internet Firewalls, 12. Maintaining Firewalls

multiple bastion hosts : Building Internet Firewalls, 4.3.1. It's OK to Use

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

need for professional installation : TCP/IP Network Administration, 12.7.1. Functions of the firewall

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

portmapper program and : Practical UNIX & Internet Security, 19.2.1. Sun's portmap/rpcbind

recreating entirely : Building Internet Firewalls, 12.5. When Should You Start Over?

resources for : Building Internet Firewalls, A. Resources

responding to probes of : Building Internet Firewalls, 12.2.4. Responding to Probes

responding to security incidents : Building Internet Firewalls, 13. Responding to Security Incidents

routing control within

TCP/IP Network Administration, 12.7.2. Routing control
TCP/IP Network Administration, E.4.2. sendmail Options

RunAsUser option : sendmail, 34.8. Alphabetized Reference

samples of : Building Internet Firewalls, 9. Two Sample Firewalls

security policies for : Building Internet Firewalls, 11. Security Policies

setting up NNTP in : Building Internet Firewalls, 8.5.3. Dangerous Ways to Set up

for specific network services : Practical UNIX & Internet Security, G. Table of IP Services

testing : Building Internet Firewalls, 6.8.7. It Should Be Able to Log Accepted and

tools for : Building Internet Firewalls, B. Tools

using BSD system as : TCP/IP Network Administration, 5.3.1.1. Options

using Linux system as : TCP/IP Network Administration, 5.2. Linux Kernel Configuration

utilities for : Building Internet Firewalls, B.6. Utilities

weakest link and : Building Internet Firewalls, 3.4. Weakest Link

what to protect : Building Internet Firewalls, 1.1. What Are You Trying to

X11 window system and : Building Internet Firewalls, 8.16. X11 Window System

FIRST mailing list : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information

FIRST response teams

Building Internet Firewalls, A.5.2. FIRST
Practical UNIX & Internet Security, 24.6. Resuming Operation
Practical UNIX & Internet Security, E.3.3. FIRST

first-class precedence : sendmail, 14.4. Precedence

first-level domains : (see top-level domains)

Fitzgerald, Tom : Practical UNIX & Internet Security, 22.5. UDP Relayer

Flags field : TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams

flags, delivery agent

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, 14.2.3. The Message-ID: Header
sendmail, 30.4. The Equates
sendmail, 30.8. Alphabetized F= Flags
sendmail, 35.4. ?flags? in Header Definitions
(see also under specific flag)

flags, qf file : sendmail, 23.9. The qf File Internals

flags, routine table

TCP/IP Network Administration, 2.5. The Routing Table
TCP/IP Network Administration, 7.2. The Minimal Routing Table
defining interface characteristics : TCP/IP Network Administration, 6.1.2. Checking the Interface with ifconfig

flock command : sendmail, 23.2.3. The Lock File (obsolete as of V5.62): lf

flooding

Building Internet Firewalls, 1.2.1.2. Denial of Service
TCP/IP Network Administration, 7.4.3. Open Shortest Path First
TCP/IP Network Administration, B.8.1. The ospf Statement
client : Practical UNIX & Internet Security, 16.3.2. Security and Nameservice
messages : Practical UNIX & Internet Security, 25.3.2. Message Flooding
servers with requests : Practical UNIX & Internet Security, 25.3.1. Service Overloading
water : (see water)

floors, raised : Practical UNIX & Internet Security, 12.2.3.1. Raised floors and dropped ceilings

floppy disks : (see backups; media)

flow control

Building Internet Firewalls, C.6.2. Transmission Control Protocol
TCP/IP Network Administration, 1.5.2. Internet Control Message Protocol
TCP/IP Network Administration, 1.6.2. Transmission Control Protocol

flows, IPv6 : Building Internet Firewalls, 6.3.6. IP Version 6

focused address : sendmail, 17.1.1.3. Handle null address

folders : (see directories)

FollowSymLinks option : Practical UNIX & Internet Security, 18.3.2. Commands Within the <Directory>

font, Japanese conversion : sendmail, 36.7. Alphabetized Reference

foo.org database : TCP/IP Network Administration, 12.4.3.2. SATAN

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

forged mail messages

sendmail, 13.2.1. The Location of the Queue Directory
sendmail, 22.7. Forged Mail

forged packets : Building Internet Firewalls, 6.3.7. Non-IP Protocols

forgery : (see also security)

man-in-the-middle : Building Internet Firewalls, 6.6.1. Risks of Filtering by Source
source address : Building Internet Firewalls, 6.6.1. Risks of Filtering by Source

fork command

Practical UNIX & Internet Security, 23.2. Tips on Avoiding Security-related Bugs
Practical UNIX & Internet Security, 25.2.1.1. Too many processes
Practical UNIX & Internet Security, C.2. Creating Processes
sendmail, 30.6.1. Fork
sendmail, 34.8. Alphabetized Reference

FORK macro : sendmail, 18.8. Alphabetized Reference

ForkEachJob (Y) option : sendmail, 34.8. Alphabetized Reference

format

address

sendmail, 6.3. The local Delivery Agent
sendmail, 31.10. Alphabetized Reference

db files : DNS & BIND, A.1. Master File Format

file, monitoring : Practical UNIX & Internet Security, 8.2. Monitoring File Format

logging channels : DNS & BIND, 7.5.2.5. Data formatting for all channels

packets

DNS & BIND, 11.6.1. Seeing the Query and Response Packets
DNS & BIND, 14.2.1. DNS Packet Format

packet message : DNS & BIND, A.2. DNS Message

redoing as destructive attack : Practical UNIX & Internet Security, 25.1. Destructive Attacks

resource record data : DNS & BIND, A.4.1. Data Format

USERFILE entries : Practical UNIX & Internet Security, 15.4.1.3. Format of USERFILE entry without system name

FORMERR responses : DNS & BIND, 7.6.2. Understanding the BIND Statistics

Forum of Incident Response and Security Teams (FIRST) : TCP/IP Network Administration, 12.1.2.2. Use mailing lists to distribute information

.forward file

Practical UNIX & Internet Security, 11.5.2.5. .forward, .procmailrc

Practical UNIX & Internet Security, 21.4.2. Electronic Mail

Practical UNIX & Internet Security, 24.4.1.6. Changes to startup files

sendmail, 18.8. Alphabetized Reference

sendmail, 22.5.3. Permissions for ~/.forward Files

sendmail, 23.9. The qf File Internals

sendmail, 25.7. The User's ~/.forward File

sendmail, 34.8. Alphabetized Reference

TCP/IP Network Administration, 10.3.1. Personal mail forwarding

chain of : sendmail, 25.7.1. Unscrambling Forwards

ForwardPath (J) option

sendmail, 22.8.3.2. The ForwardPath option
sendmail, 34.8. Alphabetized Reference

smrsh program : sendmail, 22.8.2. The smrsh Program

forward-only name servers : DNS & BIND, 10.8. A More Restricted Name Server

forward-only substatement : DNS & BIND, F.1.10.1. options forward-only

forwarders

DNS & BIND, 10.7. Building Up a Large Site-wide Cache with Forwarders
DNS & BIND, 15.4.3. Internet Forwarders
sendmail, 8.1.1. The dc.gov Domain
TCP/IP Network Administration, 8.3.1.1. Configuring a caching-only nameserver
TCP/IP Network Administration, C.2. named.boot Configuration Commands

forwarders directive

DNS & BIND, 10.7. Building Up a Large Site-wide Cache with Forwarders
DNS & BIND, F.1.5. forwarders

forwarding

sendmail, 29.6.6. Forwarding over the Network
TCP/IP Network Administration, 1.5.1.4. Passing datagrams to the transport layer
loops : sendmail, 25.7.2. Forwarding Loops
with Resent- headers : sendmail, 35.7. Forwarding with Resent-Headers

ForwardPath (J) option

sendmail, 22.8.3.2. The ForwardPath option
sendmail, 34.8. Alphabetized Reference

FQDNs (fully qualified domain names)

DNS & BIND, 2.1.1. Domain Names

DNS & BIND, 6.1.2. The Search List

sendmail, 4.2. Verbose (-v)

sendmail, 7.3.1. The hostname

sendmail, 8.1. A Fictional Network

sendmail, 21.1. Overview

TCP/IP Network Administration, 3.3.3. Domain Names

(see also $j macro)

trailing dot for

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

fragmentation

Building Internet Firewalls, 6.3.1.2. IP layer
Building Internet Firewalls, 6.3.2.2. IP fragmentation
Building Internet Firewalls, C.5.1.3. Fragmenting datagrams
TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams
avoiding : TCP/IP Network Administration, 6.1.5.4. Maximum transmission unit
datagrams : (see datagrams)

Fragmentation Offset field : TCP/IP Network Administration, 1.5.1.3. Fragmenting datagrams

Frame Ground (FG) : Practical UNIX & Internet Security, 14.3. The RS-232 Serial Protocol

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

fraud

Practical UNIX & Internet Security, 14.4.1. One-Way Phone Lines
Practical UNIX & Internet Security, 26.2.2. Federal Jurisdiction

FreeBSD systems

TCP/IP Network Administration, 5.3. The BSD Kernel Configuration File
TCP/IP Network Administration, 5.3.1.1. Options

freezing sendmail.cf configuration file : sendmail, 36.7. Alphabetized Reference

"From:" header line

sendmail, 1.5. The Header
sendmail, 5.3.10. Trusted Users
sendmail, 14.1.1. The From: Header
sendmail, 18.8. Alphabetized Reference
sendmail, 30.7. Pitfalls
sendmail, 30.8. Alphabetized F= Flags
sendmail, 31.10. Alphabetized Reference
sendmail, 34.8. Alphabetized Reference
sendmail, 35.7.1. Remove and Recreate the From: Header
sendmail, 35.10. Alphabetized Reference
(see also $l macro)
(see also trusted users)

from= equate (syslog output) : sendmail, 26.1.3.3. from= show envelope sender

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

fsck program

Practical UNIX & Internet Security, 24.4.1.7. Hidden files and directories
Practical UNIX & Internet Security, 25.2.2.8. Tree-structure attacks

fsirand command : Practical UNIX & Internet Security, 20.4.8. Use fsirand

FSP (File Service Protocol)

Building Internet Firewalls, 2.2. File Transfer
Building Internet Firewalls, 8.2.3. File Service Protocol (FSP)

fstab file

Practical UNIX & Internet Security, 11.1.2. Back Doors and Trap Doors
Practical UNIX & Internet Security, 19.3.2.5. Mounting a secure filesystem
TCP/IP Network Administration, 9.1.3.2. The vfstab and fstab files

FTP (File Transfer Protocol)

Building Internet Firewalls, 2.2. File Transfer

Building Internet Firewalls, 5.8.2.4. Which services should you disable?

Building Internet Firewalls, 8.2.2. Trivial File Transfer Protocol

Practical UNIX & Internet Security, 17.3.2. (FTP) File Transfer Protocol (TCP Ports 20 and 21)

Practical UNIX & Internet Security, 17.3.2.7. Allowing only FTP access

TCP/IP Network Administration, 1.7. Application Layer

TCP/IP Network Administration, 9.6. Managing Distributed Servers

(see also TFTP)

anonymous

Practical UNIX & Internet Security, 4.1. Users and Groups
Practical UNIX & Internet Security, 17.3.2.1. Using anonymous FTP
Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP
TCP/IP Network Administration, 13.2. Anonymous FTP

anonymous

and HTTP : Practical UNIX & Internet Security, 18.2.4.1. Beware mixing HTTP with anonymous FTP

Archie : Building Internet Firewalls, 2.6. Other Information Services

configuring : Building Internet Firewalls, 8.2.1. File Transfer Protocol

in screened host architecture : Building Internet Firewalls, 9.2.1.2. FTP
in screened subnet architecture : Building Internet Firewalls, 9.1.1.2. FTP

~ftp/bin directory : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP

~ftp/etc directory : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP

~ftp/pub directory : Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP

logging transferred files : Practical UNIX & Internet Security, 10.3.3. xferlog Log File

obtaining BIND via : sendmail, 21.1.1. Which DNS? 4.8.3 or 4.9?

obtaining source code via

sendmail, 2.1. Get the Source
sendmail, 18.3. Obtain the Source

passive (or PASV) mode : Building Internet Firewalls, 8.2.1.1. Packet filtering characteristics of

passive mode

Practical UNIX & Internet Security, 17.3.2.2. Passive vs. active FTP
Practical UNIX & Internet Security, 17.3.2.3. FTP passive mode

problem for firewalls : TCP/IP Network Administration, 12.7.1. Functions of the firewall

proxying with TIS FWTK : Building Internet Firewalls, 7.7.1. FTP Proxying with

resources for : Building Internet Firewalls, A.2. FTP Sites

server, creating : TCP/IP Network Administration, 13.2.1. Creating an FTP Server

setting up server

Practical UNIX & Internet Security, 17.3.2.4. Setting up an FTP server
Practical UNIX & Internet Security, 17.3.2.6. Setting up anonymous FTP with the standard UNIX FTP

via proxy server : Building Internet Firewalls, 7.2.2. Using Custom User Procedures for

write-only incoming directory : Building Internet Firewalls, 8.2.1.6. Be careful of writable

wuarchive daemon : Building Internet Firewalls, B.5.1. wuarchive ftpd

wuarchive server : Building Internet Firewalls, 8.2.1.4. Using the wuarchive

ftp account : (see anonymous FTP)

ftp-gw proxy server : Building Internet Firewalls, 9.1.1.2. FTP

ftp.bunyip.com : TCP/IP Network Administration, 13.3.1.1. archie client software

ftp.isc.org : TCP/IP Network Administration, 8.3.4. The named.local File

ftp://rs.internic.net/netinfo/networks.txt : TCP/IP Network Administration, 3.2. The Host Table

ftpd server

Building Internet Firewalls, 5.8.2.4. Which services should you disable?
Practical UNIX & Internet Security, 8.4.2. Changing the Account's Login
Practical UNIX & Internet Security, 11.1.2. Back Doors and Trap Doors
Practical UNIX & Internet Security, 17.3.2. (FTP) File Transfer Protocol (TCP Ports 20 and 21)
Practical UNIX & Internet Security, 17.3.2.4. Setting up an FTP server
for backups : Practical UNIX & Internet Security, 7.4.5. Backups Across the Net
security hole : Practical UNIX & Internet Security, 6.5.2. Using Message Digests
UUCP enabled on : Practical UNIX & Internet Security, 15.8. UUCP Over Networks

ftpout account, firewalls : Practical UNIX & Internet Security, 21.4.4.1. Creating an ftpout account to allow FTP without proxies.

ftpusers file : Practical UNIX & Internet Security, 17.3.2.5. Restricting FTP with the standard UNIX FTP server

ftruncate system call : Practical UNIX & Internet Security, 5.1.7. File Permissions in Detail

full backups : Practical UNIX & Internet Security, 7.1.3. Types of Backups

full duplex : TCP/IP Network Administration, 6.3.5. PPP Server Configuration

full name, sender : sendmail, 36.7. Alphabetized Reference

full zone transfers : TCP/IP Network Administration, 3.3.4. BIND, resolver, and named

"Full-Name:" header line

sendmail, 14.2.1. The Full-Name: Header
sendmail, 30.8. Alphabetized F= Flags
sendmail, 35.10. Alphabetized Reference

fully qualified domain names : (see FQDNs)

function keys : Practical UNIX & Internet Security, 12.3.4.5. Function keys

functionality, add-on : Practical UNIX & Internet Security, 1.4.3. Add-On Functionality Breeds Problems

functions, SOCKS vs. network : Building Internet Firewalls, 7.6. Using SOCKS for

future of sendmail : sendmail, The Future

fuzzy name matching : sendmail, 18.8. Alphabetized Reference

FWALL-Users mailing list : Building Internet Firewalls, A.3.2. FWALL-Users

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