On 4/14/11 12:33 PM, Dave Cridland wrote: > So, as an experiment, I changed by SRV records the other day - mostly to > test our own handling. > > I now have: > > ;; ANSWER SECTION: > _xmpp-server._tcp.dave.cridland.net. 86400 IN SRV 5 1 5269 > peirce-6.dave.cridland.net. > _xmpp-server._tcp.dave.cridland.net. 86400 IN SRV 9 1 5269 > peirce-4.dave.cridland.net. > > In layman's terms, that's "Try connecting to peirce-6, and if that > fails, try peirce-4". > > Predictably, these are IPv6 and IPv4 single-stack hostnames: > > ;; ADDITIONAL SECTION: > peirce-6.dave.cridland.net. 86400 IN AAAA > 2001:470:1f09:882:2e0:81ff:fe29:d16a > peirce-4.dave.cridland.net. 86400 IN A 217.155.137.61 > > Actually the same host, as you can see: > > peirce.dave.cridland.net. 86400 IN A 217.155.137.61 > peirce.dave.cridland.net. 86400 IN AAAA > 2001:470:1f09:882:2e0:81ff:fe29:d16a > > So the question is, can anyone not "see" me? > > An easy way to check is by discoing my server. > > So far, I have found two server implementations that can no longer see me. > > Dave.
I don't know that this is "broken" so much as "liberal in what you accept". RFC 3920 was ambiguous on whether to fall back to A/AAAA lookups if SRV failed, but leaned toward doing fallback even if SRV failed. RFC 6120 is more strict in this regard. Peter -- Peter Saint-Andre https://stpeter.im/
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