Reference Guide

Table Of Contents
Dynamic Counters.................................................................................................................................................392
Clearing Interface Counters...........................................................................................................................392
22 Internet Protocol Security (IPSec)..................................................................................... 395
Configuring IPSec ................................................................................................................................................ 395
23 IPv4 Routing........................................................................................................................... 397
IP Addresses.........................................................................................................................................................397
Implementation Information...........................................................................................................................397
Configuration Tasks for IP Addresses.................................................................................................................. 397
Assigning IP Addresses to an Interface...............................................................................................................398
Configuring Static Routes.....................................................................................................................................399
Configure Static Routes for the Management Interface...................................................................................... 400
Enabling Directed Broadcast................................................................................................................................401
Resolution of Host Names.................................................................................................................................... 401
Enabling Dynamic Resolution of Host Names...................................................................................................... 401
Specifying the Local System Domain and a List of Domains................................................................................402
Configuring DNS with Traceroute........................................................................................................................ 402
ARP....................................................................................................................................................................... 403
Configuration Tasks for ARP.................................................................................................................................403
Configuring Static ARP Entries............................................................................................................................. 403
Enabling Proxy ARP.............................................................................................................................................. 404
Clearing ARP Cache..............................................................................................................................................404
ARP Learning via Gratuitous ARP.........................................................................................................................405
Enabling ARP Learning via Gratuitous ARP..........................................................................................................405
ARP Learning via ARP Request............................................................................................................................ 405
Configuring ARP Retries....................................................................................................................................... 406
ICMP..................................................................................................................................................................... 407
Configuration Tasks for ICMP...............................................................................................................................407
Enabling ICMP Unreachable Messages...............................................................................................................407
UDP Helper........................................................................................................................................................... 408
Configure UDP Helper.................................................................................................................................... 408
Important Points to Remember...................................................................................................................... 408
Enabling UDP Helper............................................................................................................................................ 408
Configuring a Broadcast Address........................................................................................................................ 409
Configurations Using UDP Helper.........................................................................................................................409
UDP Helper with Broadcast-All Addresses..........................................................................................................409
UDP Helper with Subnet Broadcast Addresses...................................................................................................410
UDP Helper with Configured Broadcast Addresses.............................................................................................411
UDP Helper with No Configured Broadcast Addresses....................................................................................... 411
Troubleshooting UDP Helper................................................................................................................................ 412