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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
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