Re: c-ares and IPv6
Date: Tue, 4 Aug 2009 10:35:34 +0200 (CEST)
On Tue, 4 Aug 2009, Kamil Dudka wrote:
> I've spotted some inconsistency between curl and c-ares documentation. In
> curl's FAQ  is stated that c-ares has no IPv6 support. But going through
> c-ares mailing list  I can see the IPv6 works with c-ares already.
> Shouldn't we update the FAQ?
Ah yes we should.
c-ares handles IPv6 rather good these days. The biggest flaw I'm still aware
of is for host names that return both A and AAAA fields, as c-ares has no
getaddrinfo() equivalent that returns a mix of A and AAAA resolves.
I believe the current implementation will then favor AAAA, which is more than
just annoying if you happen to not have an IPv6 stack working locally...
Test site: ftp.funet.fi. I can't connect to it with curl built with c-ares, as
it'll prefer its IPv6 address:
$ curl ftp.funet.fi
curl: (7) Failed to connect to 2001:708:10:9::20:1: Network is unreachable
"curl -4 ftp.funet.fi" works fine however, as then it'll just ask for A
-- / daniel.haxx.seReceived on 2009-08-04