GNU bug report logs - #17976
24.3; url-retrieve-synchronously doesn't fallback to IPv4

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Message #51 received at 17976 <at> debbugs.gnu.org (full text, mbox):

From: Juliusz Chroboczek <jch <at> pps.univ-paris-diderot.fr>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 17976 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 Andreas Schwab <schwab <at> linux-m68k.org>
Subject: Re: bug#17976: 24.3;
 url-retrieve-synchronously doesn't fallback to IPv4
Date: Sat, 26 Dec 2015 00:15:44 +0100

>> This is independent of IPv6.  A hostname could also resolve to multiple
>> IPv4 addresses where only one of them is (currently) reachable.

Please hear this man.

> But how does this work in practice?  How are we doing name resolution?
> Do we have access to all the IP addresses?  Do we have access to the
> IPv6 addresses without...  doing stuff?  :-)

If we don't, it's a bug that must be fixed.  The multihoming techniques
that are being developed at IETF right now rely on giving multiple
addresses to a single host (and implementing a routing infrastructure to
match), we really need to be trying them all.

-- Juliusz

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