Okay I think I've found a problem with getaddrinfo() when the AF_INET6
family is specified. For example, Python's socket.getaddrinfo() provides
scope ID if _all_ families are looked-up, but it returns scope ID of 0
if only IPv6 family is looked up. E.g. in Python:
>>> import socket
>>> from pprint import pprint
>>> a = socket.getaddrinfo("craig-linux.local", None)
>>> pprint(a)
[(10, 1, 6, '', ('fe80::21b:21ff:febb:73b2%eth2', 0, 0, 3)),
(10, 2, 17, '', ('fe80::21b:21ff:febb:73b2%eth2', 0, 0, 3)),
(10, 3, 0, '', ('fe80::21b:21ff:febb:73b2%eth2', 0, 0, 3)),
(2, 1, 6, '', ('192.168.5.3', 0)),
(2, 2, 17, '', ('192.168.5.3', 0)),
(2, 3, 0, '', ('192.168.5.3', 0))]
>>> a = socket.getaddrinfo("craig-linux.local", None, socket.AF_INET6)
>>> pprint(a)
[(10, 1, 6, '', ('fe80::21b:21ff:febb:73b2', 0, 0, 0)),
(10, 2, 17, '', ('fe80::21b:21ff:febb:73b2', 0, 0, 0)),
(10, 3, 0, '', ('fe80::21b:21ff:febb:73b2', 0, 0, 0))]
So for some reason the scope ID is present when doing all-families look-
up, but lacking in the IPv6-only family look-up.
ping6 fails because it is specifying AF_INET6.
I've got a test server listening on both IPv4 and IPv6. If I connect to
it with "telnet craig-linux.local 12100" then it is able to connect
successfully to the IPv6 address. But if I specify the -6 switch,
"telnet -6 craig-linux.local 12100" then it fails to connect.
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https://bugs.launchpad.net/bugs/369008
Title:
mdns lookups fail over ipv6
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