Users Guide

21 IPv4 Routing...................................................................................................................................................... 346
IP Addresses.............................................................................................................................................................347
Implementation Information..........................................................................................................................347
Configuration Tasks for IP Addresses................................................................................................................ 347
Assigning IP Addresses to an Interface..............................................................................................................347
Configuring Static Routes.................................................................................................................................... 348
Configure Static Routes for the Management Interface............................................................................... 349
IPv4 Path MTU Discovery Overview...................................................................................................................350
Using the Configured Source IP Address in ICMP Messages....................................................................... 350
Configuring the ICMP Source Interface......................................................................................................350
Configuring the Duration to Establish a TCP Connection.............................................................................351
Enabling Directed Broadcast................................................................................................................................351
Resolution of Host Names....................................................................................................................................351
Enabling Dynamic Resolution of Host Names.................................................................................................352
Specifying the Local System Domain and a List of Domains........................................................................352
Configuring DNS with Traceroute......................................................................................................................353
ARP............................................................................................................................................................................ 353
Configuration Tasks for ARP................................................................................................................................354
Configuring Static ARP Entries............................................................................................................................ 354
Enabling Proxy ARP................................................................................................................................................354
Clearing ARP Cache...............................................................................................................................................355
ARP Learning via Gratuitous ARP........................................................................................................................ 355
Enabling ARP Learning via Gratuitous ARP....................................................................................................... 355
ARP Learning via ARP Request............................................................................................................................ 356
Configuring ARP Retries....................................................................................................................................... 356
ICMP..........................................................................................................................................................................357
Configuration Tasks for ICMP..............................................................................................................................357
Enabling ICMP Unreachable Messages..............................................................................................................357
UDP Helper..............................................................................................................................................................358
Configure UDP Helper.................................................................................................................................... 358
Important Points to Remember.................................................................................................................... 358
Enabling UDP Helper.............................................................................................................................................358
Configuring a Broadcast Address....................................................................................................................... 358
Configurations Using UDP Helper......................................................................................................................359
UDP Helper with Broadcast-All Addresses....................................................................................................... 359
UDP Helper with Subnet Broadcast Addresses............................................................................................... 360
UDP Helper with Configured Broadcast Addresses....................................................................................... 360
UDP Helper with No Configured Broadcast Addresses................................................................................. 361
Troubleshooting UDP Helper.............................................................................................................................. 361
22 IPv6 Routing...................................................................................................................................................... 362
Protocol Overview................................................................................................................................................. 362
Extended Address Space.................................................................................................................................363
Stateless Autoconfiguration...........................................................................................................................363
IPv6 Headers..................................................................................................................................................... 363
IPv6 Header Fields............................................................................................................................................364
Contents
13