IP Addresses...................................................................................................................................................................400
Implementation Information.................................................................................................................................... 401
Conguration Tasks for IP Addresses.................................................................................................................... 401
IPv4 Path MTU Discovery Overview.......................................................................................................................... 403
Using the Congured Source IP Address in ICMP Messages..................................................................................404
Conguring the ICMP Source Interface............................................................................................................... 404
Conguring the Duration to Establish a TCP Connection........................................................................................ 404
Enabling Directed Broadcast........................................................................................................................................ 405
Resolution of Host Names............................................................................................................................................405
Enabling Dynamic Resolution of Host Names......................................................................................................405
Specifying the Local System Domain and a List of Domains............................................................................. 406
Conguring DNS with Traceroute......................................................................................................................... 406
ARP..................................................................................................................................................................................407
Conguration Tasks for ARP.................................................................................................................................. 407
ARP Learning via Gratuitous ARP............................................................................................................................... 409
ARP Learning via ARP Request................................................................................................................................... 409
Conguring ARP Retries................................................................................................................................................410
ICMP.................................................................................................................................................................................411
Conguration Tasks for ICMP..................................................................................................................................411
UDP Helper...................................................................................................................................................................... 411
Congure UDP Helper.............................................................................................................................................. 411
Important Points to Remember............................................................................................................................... 411
Enabling UDP Helper................................................................................................................................................412
Congurations Using UDP Helper................................................................................................................................ 412
UDP Helper with Broadcast-All Addresses............................................................................................................412
UDP Helper with Subnet Broadcast Addresses....................................................................................................413
UDP Helper with Congured Broadcast Addresses.............................................................................................413
UDP Helper with No Congured Broadcast Addresses.......................................................................................414
Troubleshooting UDP Helper.........................................................................................................................................414
27 IPv6 Routing.............................................................................................................................................416
Protocol Overview..........................................................................................................................................................416
Extended Address Space.........................................................................................................................................417
Stateless Autoconguration.................................................................................................................................... 417
IPv6 Header Fields......................................................................................................................................................... 418
Version (4 bits)..........................................................................................................................................................418
Trac Class (8 bits)................................................................................................................................................. 418
Flow Label (20 bits)..................................................................................................................................................418
Payload Length (16 bits)..........................................................................................................................................418
Next Header (8 bits)................................................................................................................................................419
Hop Limit (8 bits)......................................................................................................................................................419
Source Address (128 bits).......................................................................................................................................420
Destination Address (128 bits)............................................................................................................................... 420
Extension Header Fields................................................................................................................................................420
Hop-by-Hop Options Header................................................................................................................................. 420
Addressing....................................................................................................................................................................... 421
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