Enhanced Validation of Interface Ranges........................................................................................434
Enhanced Control of Remote Fault Indication Processing............................................................434
23 Internet Protocol Security (IPSec).............................................................. 435
Configuring IPSec ............................................................................................................................436
24 IPv4 Routing................................................................................................... 437
IP Addresses......................................................................................................................................437
Implementation Information......................................................................................................437
Configuration Tasks for IP Addresses........................................................................................438
IPv4 Path MTU Discovery Overview.................................................................................................441
Using the Configured Source IP Address in ICMP Messages..........................................................441
Configuring the ICMP Source Interface.....................................................................................442
Configuring the Duration to Establish a TCP Connection..............................................................442
Enabling Directed Broadcast............................................................................................................443
Resolution of Host Names...............................................................................................................443
Enabling Dynamic Resolution of Host Names..........................................................................443
Specifying the Local System Domain and a List of Domains....................................................444
Configuring DNS with Traceroute.............................................................................................444
ARP....................................................................................................................................................445
Configuration Tasks for ARP......................................................................................................446
ARP Learning via Gratuitous ARP.....................................................................................................447
ARP Learning via ARP Request.........................................................................................................448
Configuring ARP Retries...................................................................................................................449
ICMP..................................................................................................................................................449
Configuration Tasks for ICMP....................................................................................................449
UDP Helper.......................................................................................................................................450
Configure UDP Helper................................................................................................................450
Important Points to Remember.................................................................................................450
Enabling UDP Helper..................................................................................................................450
Configurations Using UDP Helper....................................................................................................451
UDP Helper with Broadcast-All Addresses.................................................................................451
UDP Helper with Subnet Broadcast Addresses..........................................................................452
UDP Helper with Configured Broadcast Addresses..................................................................453
UDP Helper with No Configured Broadcast Addresses............................................................453
Troubleshooting UDP Helper...........................................................................................................453
25 IPv6 Addressing..............................................................................................455
Protocol Overview............................................................................................................................455
Extended Address Space.............................................................................................................455
Stateless Autoconfiguration.......................................................................................................455
IPv6 Header Fields.............................................................................................................................457
15