Bugs item #2991177, was opened at 2010-04-23 03:30
Message generated for change (Comment added) made by bagder
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Category: name resolving/DNS
Group: wrong behaviour
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Cristian Rodriguez (judas_iscariote)
Assigned to: Daniel Stenberg (bagder)
Summary: curl does not fallback to A records when ipv6 connectionfail

Initial Comment:
curl -7.20.1
libcares 1.7.1

$curl http://tclers.tk
curl: (7) Failed to connect to 2002:3e70:9ee8::1001: Network is unreachable

I would expect curl to try the DNS records in turn until one succeeds and only
error out when all of them failed. (at least have the same behaviour that without c-ares)

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>Comment By: Daniel Stenberg (bagder)
Date: 2010-04-23 22:36

Message:
This is more a (known) bug in c-ares than in libcurl, as it should most
likely be the responsibility of the resolver to resolve BOTH ipv4 and ipv6
names, similar to getaddrinfo() does.

libcurl _could_ of course be made to work around this c-ares limitation,
but to me it seems better to put that effort into the resolver code instead
to the benefit of more applications and users.

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Received on 2010-04-23