Concept Guide

Display discard counters.......................................................................................................................................... 461
23 Internet Protocol Security (IPSec)...........................................................................................................463
Conguring IPSec .........................................................................................................................................................463
24 IPv4 Routing............................................................................................................................................465
IP Addresses...................................................................................................................................................................466
Implementation Information....................................................................................................................................466
Conguration Tasks for IP Addresses......................................................................................................................... 466
Assigning IP Addresses to an Interface.......................................................................................................................466
Conguring Static Routes.............................................................................................................................................467
Congure Static Routes for the Management Interface..........................................................................................468
IPv4 Path MTU Discovery Overview.......................................................................................................................... 469
Packet handling during MTU mismatch................................................................................................................469
Using the Congured Source IP Address in ICMP Messages..................................................................................469
Conguring the ICMP Source Interface............................................................................................................... 469
Conguring the Duration to Establish a TCP Connection........................................................................................ 470
Enabling Directed Broadcast........................................................................................................................................ 470
Resolution of Host Names............................................................................................................................................470
Enabling Dynamic Resolution of Host Names.............................................................................................................471
Specifying the Local System Domain and a List of Domains.................................................................................... 471
Conguring DNS with Traceroute................................................................................................................................472
ARP..................................................................................................................................................................................472
Conguration Tasks for ARP........................................................................................................................................ 473
Conguring Static ARP Entries....................................................................................................................................473
Enabling Proxy ARP.......................................................................................................................................................473
Clearing ARP Cache...................................................................................................................................................... 474
ARP Learning via Gratuitous ARP................................................................................................................................474
Enabling ARP Learning via Gratuitous ARP................................................................................................................ 474
ARP Learning via ARP Request....................................................................................................................................474
Conguring ARP Retries............................................................................................................................................... 475
ICMP................................................................................................................................................................................476
Conguration Tasks for ICMP...................................................................................................................................... 476
Enabling ICMP Unreachable Messages...................................................................................................................... 476
UDP Helper.....................................................................................................................................................................476
Congure UDP Helper.............................................................................................................................................476
Important Points to Remember..............................................................................................................................477
Enabling UDP Helper..................................................................................................................................................... 477
Congurations Using UDP Helper................................................................................................................................477
UDP Helper with Broadcast-All Addresses................................................................................................................. 477
UDP Helper with Subnet Broadcast Addresses.........................................................................................................478
UDP Helper with Congured Broadcast Addresses.................................................................................................. 479
UDP Helper with No Congured Broadcast Addresses............................................................................................479
Troubleshooting UDP Helper........................................................................................................................................ 479
25 IPv6 Routing............................................................................................................................................ 481
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