Concept Guide

Conguring IPSec .........................................................................................................................................................452
23 IPv4 Routing............................................................................................................................................454
IP Addresses...................................................................................................................................................................455
Implementation Information................................................................................................................................... 455
Conguration Tasks for IP Addresses......................................................................................................................... 455
Assigning IP Addresses to an Interface.......................................................................................................................455
Conguring Static Routes............................................................................................................................................ 456
Adding description for IPv4 and IPv6 static routes............................................................................................. 457
Congure Static Routes for the Management Interface..........................................................................................458
IPv4 Path MTU Discovery Overview.......................................................................................................................... 458
Packet handling during MTU mismatch................................................................................................................459
Using the Congured Source IP Address in ICMP Messages..................................................................................459
Conguring the ICMP Source Interface............................................................................................................... 459
Conguring the Duration to Establish a TCP Connection........................................................................................ 460
Enabling Directed Broadcast........................................................................................................................................ 460
Resolution of Host Names............................................................................................................................................460
Enabling Dynamic Resolution of Host Names.............................................................................................................461
Specifying the Local System Domain and a List of Domains.................................................................................... 461
Conguring DNS with Traceroute................................................................................................................................462
ARP................................................................................................................................................................................. 462
Conguration Tasks for ARP........................................................................................................................................ 463
Conguring Static ARP Entries....................................................................................................................................463
Enabling Proxy ARP.......................................................................................................................................................463
Clearing ARP Cache......................................................................................................................................................464
ARP Learning via Gratuitous ARP................................................................................................................................464
Enabling ARP Learning via Gratuitous ARP................................................................................................................464
ARP Learning via ARP Request................................................................................................................................... 464
Conguring ARP Retries...............................................................................................................................................465
ICMP............................................................................................................................................................................... 466
Conguration Tasks for ICMP......................................................................................................................................466
Enabling ICMP Unreachable Messages...................................................................................................................... 466
ICMP Redirects..............................................................................................................................................................466
UDP Helper.....................................................................................................................................................................467
Congure UDP Helper.............................................................................................................................................467
Important Points to Remember............................................................................................................................. 468
Enabling UDP Helper.....................................................................................................................................................468
Conguring a Broadcast Address................................................................................................................................ 468
Congurations Using UDP Helper............................................................................................................................... 469
UDP Helper with Broadcast-All Addresses.................................................................................................................469
UDP Helper with Subnet Broadcast Addresses.........................................................................................................470
UDP Helper with Congured Broadcast Addresses.................................................................................................. 470
UDP Helper with No Congured Broadcast Addresses.............................................................................................471
Troubleshooting UDP Helper.........................................................................................................................................471
24 IPv6 Routing............................................................................................................................................ 472
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