https://bugzilla.wikimedia.org/show_bug.cgi?id=17140


Brion Vibber <[email protected]> changed:

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--- Comment #4 from Brion Vibber <[email protected]>  2009-02-27 18:38:40 UTC 
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On my Mac at the office, I've only got fe80:* local IPv6 addresses. Note that
IPv4 has a reserved local address, as this is on a NAT'ed LAN.

IPv6 works on the LAN....

$ ping filesrv1.local
PING filesrv1.local (192.168.1.2): 56 data bytes
64 bytes from 192.168.1.2: icmp_seq=0 ttl=64 time=14.417 ms

$ ping6 filesrv1.local
PING6(56=40+8+8 bytes) fe80::21e:c2ff:fea5:98d1%en1 -->
fe80::21a:a0ff:fe0e:27bf%en1
16 bytes from fe80::21a:a0ff:fe0e:27bf%en1, icmp_seq=0 hlim=64 time=5.546 ms


But there's no external connectivity via v6:

$ host bugzilla.wikimedia.org
bugzilla.wikimedia.org is an alias for isidore.wikimedia.org.
isidore.wikimedia.org has address 208.80.152.179
isidore.wikimedia.org has IPv6 address 2620::860:2:230:48ff:fe71:5cf6

$ ping bugzilla.wikimedia.org
PING isidore.wikimedia.org (208.80.152.179): 56 data bytes
64 bytes from 208.80.152.179: icmp_seq=0 ttl=46 time=93.758 ms

$ ping6 bugzilla.wikimedia.org
ping6: UDP connect: No route to host


The system seems to be quite aware that there's no v6 route available to the
outside; problem seems to be that whatever Opera's doing to connect, it's not
figuring out that it should fall back to v4 which does have a perfectly good
route. It *should* fail out immediately; there's no need to time out waiting
for packets to fail to come back, you just plain don't have a route to send to.


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