Overview
- Almost all networks on campus will provide you with an auto-configured global IPv6 address. If IPv6 is enabled on your system, it will just work! Virginia Tech’s global prefixes are 2001:468::c80::/48 and 2607:b400::/32. If you have an interface with an address beginning with one of these prefixes, you should have IPv6 connectivity. See KB0011127 for more details.
- https://test-ipv6.com (3rd-party service) will show you if you are connecting with IPv6.
- Prefixes beginning with 2002:: are 6to4, an automatic tunneling method. In general, you should not be using these prefixes and should not see them anywhere near the VT end of a traceroute.
DNS Resolvers
All of the campus DNS resolvers support IPv6. Visit the DNS Resolver Knowledge Base article for more information.
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DNS Resolver
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Address
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yardbird.cns.vt.edu
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2001:468:c80:2101:0:100:0:22
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jeru.cns.vt.edu
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2001:468:c80:4101:0:100:0:42
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milo.cns.vt.edu
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2001:468:c80:6101:0:100:0:62
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DNS Records
- The DNS record for an IPv6 address is type AAAA (said as "quad A").
- Tools (such as dig) that lookup addresses only return the AAAA record if you specifically ask for it.
- Network liaisons can add IPv6 addresses to their hosts in DNS. These are handled with the new CSV format (see the Network Liaison Guide).
- When adding IPv6 to your hosts in VT DNS, the IPv6 address reverses to host.dept.ipv6.vt.edu and a matching forward record is added automatically.
- Use of the .ipv6.vt.edu address assures connection is via IPv6 - there are no A records in this zone.
- We also add a host.dept.ipv4.vt.edu record which only returns the IPv4 address when you need to connect with IPv4.