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

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From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 17976 <at> debbugs.gnu.org, Juliusz Chroboczek <jch <at> pps.univ-paris-diderot.fr>
Subject: bug#17976: 24.3; url-retrieve-synchronously doesn't fallback to IPv4
Date: Fri, 25 Dec 2015 22:00:42 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Juliusz Chroboczek <jch <at> pps.univ-paris-diderot.fr> writes:
>
>> My machine has both IPv6 and IPv4.  I'm accessing a server that has both
>> IPv6 and IPv4, but whose web server listens on IPv4 only.  The web server
>> is doing the right thing, sending RST upon IPv6 connection attempts.  Wget
>> and telnet do the right thing, they fallback to IPv4:
>>
>>   $ telnet moule.informatique.univ-paris-diderot.fr 8080
>>   Trying 2001:660:3301:8070::40...
>>   Trying 194.254.199.40...
>>   Connected to moule.informatique.univ-paris-diderot.fr.
>>   Escape character is '^]'.
>
> Perhaps this should be a general network connection thing?

It needs to be fixed in open-network-stream.  Currently it doesn't
provide a way to fall back to a different address of a given host.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
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