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Configuring and Troubleshooting IPv6 in Windows Vista (part 4) - Troubleshooting IPv6 Connectivity

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Troubleshooting IPv6 Connectivity

The standard approach for troubleshooting TCP/IP network connectivity issues on IPv4 networks is to follow these steps:

1.
Type ipconfig /all at a command prompt to verify the IPv4 configuration of the computer that is experiencing the problem.

2.
If verifying the computer’s IPv4 configuration doesn’t resolve the issue, try using the ping command to test for network connectivity, beginning with the local computer and working outward until the cause of the problem is determined. Specifically, follow these steps:

a. Ping the IPv4 loopback address 127.0.0.1 to verify that TCP/IP is installed and configured properly on the computer.

b. Then ping the IPv4 address of the local computer.

c. Then ping the IPv4 address of the default gateway.

d. Then ping the IPv4 address of an IPv4 host on a remote subnet.

Other TCP/IP troubleshooting steps you can use on IPv4 networks include:

  • Use the route print command to verify the configuration of the local computer’s routing table.

  • Use tracert to verify that intermediate routers are configured properly.

  • Use the pathping command to identify packet loss over multi-hop paths.

  • Clear the ARP cache by typing netsh interface ip delete arpcache at a command prompt.

  • Verify the computer’s DNS configuration, clear the DNS client resolver cache, and verify DNS name resolution.


Troubleshooting IPv6 network connectivity issues uses many of the same tools you use when troubleshooting IPv4. However, you use some of these tools in a different way because of the nature of IPv6 addressing and the way IPv6 is implemented in Windows Vista. The differences include:

  • You might need to specify a zone ID when attempting to verify IPv6 network connectivity with a target host using the ping command. The syntax for using ping with IPv6 is ping IPv6Address%ZoneID where ZoneID is the zone ID (or scope ID) of the target host. For example, if the target host has the link-local unicast IPv6 address FE80::D3:00FF:FE28:9C5A assigned to the interface that has a zone ID of 12, to verify IPv6 connectivity with this host you would type ping FE80::D3:00FF:FE28:9C5A%12 at a command prompt. To determine the zone ID for an interface, you can either use the ipconfig /all command or type netsh interface ipv6 show interface at a command prompt. Note that since the zone ID is locally defined, a sending host and a receiving host on the same link may have different zone IDs. (Global unicast IPv6 addresses do not need a zone ID.)

  • You should view and clear the neighbor cache on your computer before attempting to use ping to verify IPv6 network connectivity. The neighbor cache contains recently resolved link-layer IPv6 addresses; you can view it by typing netsh interface ipv6 show neighbors and flush it by typing netsh interface ipv6 delete neighbors at an elevated command prompt.

  • You should also view and clear the destination cache on your computer before attempting to verify IPv6 network connectivity using ping. The destination cache contains next-hop IPv6 addresses for destinations. You can view the cache by typing netsh interface ipv6 show destinationcache; you can flush it by typing netsh interface ipv6 delete destinationcache at an elevated command prompt.

  • You should use the –d option when attempting to trace the route to a remote IPv6 host using tracert, or the –n option when using pathping. These options prevent these commands from performing DNS reverse queries on every near-side router interface along the routing path. Using these options can help speed up the display of the routing path.


Note

Disabling IPv4 can also be a useful troubleshooting technique for developers who need to verify that their applications are IPv6-compatible.

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