cisco-ios-ip-confguide.pdf

Cisco IOS

Configuration Guide

Release 12.2

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Cisco IOS IP Configuration Guide

CONTENTS

About Cisco IOS Software Documentation xxix

Documentation Objectives xxix

Audience xxix

Documentation Organization xxix

Documentation Modules xxix

Master Indexes xxxii

Supporting Documents and Resources xxxii

New and Changed Information xxxiii

Document Conventions xxxiii

Obtaining Documentation xxxv

World Wide Web xxxv

Documentation CD-ROM xxxv

Ordering Documentation xxxv

Documentation Feedback xxxv

Obtaining Technical Assistance xxxvi

Cisco.com xxxvi

Technical Assistance Center xxxvi

Contacting TAC by Using the Cisco TAC Website xxxvi

Contacting TAC by Telephone xxxvii

Using Cisco IOS Software xxxix

Understanding Command Modes xxxix

Getting Help xl

Example: How to Find Command Options xli

Using the no and default Forms of Commands xliii

Saving Configuration Changes xliv

Filtering Output from the show and more Commands xliv

Identifying Supported Platforms xlv

Using Feature Navigator xlv

Using Software Release Notes xlv

IP Overview IPC-1

IP Addressing and Services IPC-1

IP Routing Protocols IPC-2

Cisco IOS IP Configuration Guide

iii

Contents

Determining a Routing Process IPC-2

Interior and Exterior Gateway Protocols IPC-2

Interior Gateway Protocols IPC-3

Exterior Gateway Protocols IPC-3

Multiple Routing Protocols IPC-3

IP Multicast IPC-4

IP ADDRESSING AND SERVICES

Configuring IP Addressing IPC-7

IP Addressing Task List IPC-7

Assigning IP Addresses to Network Interfaces IPC-7

Assigning Multiple IP Addresses to Network Interfaces IPC-9

Enabling Use of Subnet Zero IPC-9

Disabling Classless Routing Behavior IPC-10

Enabling IP Processing on a Serial Interface IPC-11

Configuring Address Resolution Methods IPC-12

Establishing Address Resolution IPC-12

Defining a Static ARP Cache IPC-13

Setting ARP Encapsulations IPC-14

Enabling Proxy ARP IPC-14

Configuring Local-Area Mobility IPC-15

Mapping Host Names to IP Addresses IPC-15

Assigning Host Names to IP Addresses IPC-16

Specifying the Domain Name IPC-16

Specifying a Name Server IPC-17

Enabling the DNS IPC-17

Using the DNS to Discover ISO CLNS Addresses IPC-17

Configuring HP Probe Proxy Name Requests IPC-18

Configuring the Next Hop Resolution Protocol IPC-18

The Cisco Implementation of NHRP IPC-18

Protocol Operation IPC-20

NHRP Configuration Task List IPC-20

Enabling NHRP on an Interface IPC-21

Configuring a Static IP-to-NBMA Address Mapping for a Station IPC-21

Statically Configuring a Next Hop Server IPC-21

Configuring NHRP Authentication IPC-22

Controlling the Triggering of NHRP IPC-22

Triggering NHRP Based on Traffic Thresholds IPC-23

Controlling the NHRP Packet Rate IPC-25

Cisco IOS IP Configuration Guide

Contents

Suppressing Forward and Reverse Record Options IPC-26

Specifying the NHRP Responder Address IPC-26

Changing the Time Period NBMA Addresses Are Advertised as Valid IPC-26

Configuring a GRE Tunnel for Multipoint Operation IPC-27

Configuring NHRP Server-Only Mode IPC-27

Enabling IP Routing IPC-27

Routing Assistance When IP Routing Is Disabled IPC-28

Proxy ARP IPC-28

Default Gateway IPC-28

ICMP Router Discovery Protocol IPC-29

Enabling IP Bridging IPC-30

Enabling Integrated Routing and Bridging IPC-30

Configuring a Routing Process IPC-30

Configuring Broadcast Packet Handling IPC-31

Enabling Directed Broadcast-to-Physical Broadcast Translation IPC-31

Forwarding UDP Broadcast Packets and Protocols IPC-32

Establishing an IP Broadcast Address IPC-33

Flooding IP Broadcasts IPC-33

Speeding Up Flooding of UDP Datagrams IPC-34

Configuring Network Address Translation IPC-35

NAT Applications IPC-35

Benefits IPC-35

NAT Terminology IPC-36

NAT Configuration Task List IPC-36

Translating Inside Source Addresses IPC-37

Configuring Static Translation IPC-38

Configuring Dynamic Translation with an Access List IPC-38

Configuring Dynamic Translation with a Route Map IPC-39

Overloading an Inside Global Address IPC-39

Translating Overlapping Addresses IPC-41

Configuring Static Translation IPC-43

Configuring Dynamic Translation IPC-43

Providing TCP Load Distribution IPC-43

Changing Translation Timeouts IPC-45

Monitoring and Maintaining NAT IPC-46

Deploying NAT Between an IP Phone and Cisco CallManager IPC-46

Monitoring and Maintaining IP Addressing IPC-47

Clearing Caches, Tables, and Databases IPC-47

Specifying the Format of Network Masks IPC-47

Cisco IOS IP Configuration Guide

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