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# Index: U

U.S. Naval Research Laboratory (NRL) : 12.2.4. OPIE
uid (user id) : 5.4. The Internet Daemon
umount command : 9.1.3.1. The mount command
unauthenticated users : 9.1.5. NFS Authentication Server
unexpected, dealing with the : 11. Troubleshooting TCP/IP
unicast : 2.2.2.1. Final notes on IP addresses
unicast addresses : (see addresses)
universal resource locators (URLs) : 13.1. The World Wide Web
UNIX : 1. Overview of TCP/IP
  computers : Audience
  kernels : 4.2.2. Defining the Subnet Mask
  services : 2.7.2. Port Numbers
  systems
    Foreword from the First Edition
    3.3.4. BIND, resolver, and named
    7.4.1. Routing Information Protocol
    7.5.3. Choosing a Routing Protocol
    installation scripts for : 6.1.1. Determining the Interface Name
  vendor, for security information : 12.1.2.2. Use mailing lists to distribute information
  versions of
    3.2. The Host Table
    6.1. The ifconfig Command
UNIX commands
  ability to use : 9.1. The Network File System
  r-commands
    9.6. Managing Distributed Servers
    12.2.5. Secure the r Commands
    disabling : 12.2.6. Secure Shell
  tar : 9.7.1. POP Server
  untar : 9.7.2. IMAP Server
unknown host error message
  11.3. Testing Basic Connectivity
  11.6. Checking Name Service
unreachable destinations, detecting : 1.5.2. Internet Control Message Protocol
Unreachable Port message : 11.5.2. Tracing Routes
unused accounts
  removing from system : 12.2.2. Choosing a Password
  security problems with : 12.2.1. The Shadow Password File
UPDATE messages : 7.5.2. Border Gateway Protocol
updating : 7.5.1. Exterior Gateway Protocol
URLs (universal resource locators) : 13.1. The World Wide Web
Usenet news : E.3.5. MAILER
user authentication
  9.3.2. NIS+
  12.2. User Authentication
User Datagram Protocol (UDP)
  1.2. A Data Communications Model
  1.3. TCP/IP Protocol Architecture
  1.6. Transport Layer
  checksum errors in : 5.3.1.1. Options
user security responsibilities : 12.1.3. Writing a Security Policy
/usr directory
  /usr/adm/messages file, in security checks : 12.4.2.2. Checking login activity
  /usr/etc/bootpd file : 9.6.1. rdist
  /usr/sbin/imapd file : 9.7.2. IMAP Server
  /usr/src/linux source directory : 5.2. Linux Kernel Configuration
  /usr/src/sys/i386/conf directory : 5.3. The BSD Kernel Configuration File
  /usr/tmp/gated_dump file : B.1.1. Signal Processing
USRX command, in ESMTP : 3.4.3. Multipurpose Internet Mail Extensions
UUCP protocol
  3.4.1. Simple Mail Transfer Protocol
  10.5.8. Defining Mailers
  bang syntax : 10.7.1. Modifying Local Information
uucp service : 5.4. The Internet Daemon
  system connected with : 10.5.3. The Define Class Command
UUCP sites, serving
  E.3. m4 sendmail Macros
  E.3.5. MAILER
UUCP-style lock files
  6.3.4. PPP Daemon Security
  A.2. The PPP Daemon

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