You are called to assist in troubleshooting a network problem that has occurred

Question

You are called to assist in troubleshooting a network problem that has occurred soon after a significant IPv6 implementation. Some network hosts seem to have network access, but their browsers do not resolve URLs that are entered. The network technicians troubleshooting the problem have discovered that the hosts in question can ping other network hosts on a different network segment, but only via IPv6 addresses. Hosts on the other network segment can resolve URLs entered into their browsers. As a note, all network hosts derive their IPv6 addresses using stateful address autoconfig.



Discussion Questions

a. What could be the possible issue or issues?

b. And what Wireshark display filter could you use to quickly determine the network problem?

Explanation / Answer

Possible issues are:

1. ipv4 routers are not able to upgrade to ipv6

2. proble may be there after upgrading services to ipv6

3. your current isp doesn;t support ipv6

4. security issues can be there when you are tunneling to a 6 to 4 relay router

Filters that you can use in wireshark for displaying ipv6 related information:

ipv6 - for showing only the IPv6 based traffic

- this is for specific ipv6 address(es)

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