DNS64 Test

[mfeit-internet2]

Develop a dns64 test and tool plugin pair that checks for the correct functioning of a DNS64 server (see https://en.wikipedia.org/wiki/IPv6_transition_mechanism#DNS64).

Test parameters:

• host - Hostname to look up
• nameserver - Name server to query
• translation-prefix - Translation prefix to expect for converted results (tools should default to 64:ff9b::/96)
• timeout - How long to wait for an answer

Result:

• ipv4 - IPv4 address returned (if there was one)
• ipv6 - IPv6 address returned (if there was one)
• translated - True if ipv6 lives within the translation-prefix
• time - Response time

# IPv4-only host
$ host ip4.me
ip4.me has address 23.153.8.71

# Ask Google's DNS64 server for its address
$ host ip4.me 2001:4860:4860::64
...
ip4.me has address 23.153.8.71
ip4.me has IPv6 address 64:ff9b::1799:847

# Same, but for a host that has an IPv6 address
$ host ip6.me 2001:4860:4860::64
Using domain server:
...
ip6.me has address 23.153.8.71
ip6.me has IPv6 address 2001:4810:0:3::71