v6 connection refused for AS112 webserver

Mikael Abrahamsson swmike at swm.pp.se
Wed Jan 2 20:16:24 CET 2013

On Wed, 2 Jan 2013, Frank Habicht wrote:

> Hi,
> who gets the same?
> (psg.com does)
> [frank at cacti ~]$ wget -6 'http://public.as112.net/'
> --2013-01-02 21:21:55--  http://public.as112.net/
> Resolving public.as112.net... 2001:4f8:3:2bc:1::72
> Connecting to public.as112.net|2001:4f8:3:2bc:1::72|:80... failed:
> Connection refused.
> [frank at cacti ~]$
> guess happy eyeballs working too well for many.

You don't really need happy eyeballs as long as you get connection 
refused. Much better to just give RST if a service is not supported over 
IPv6, than to drop the packet. RST gives TCP a chance to try other 
IP(v4|v6) addresses and see if it can establish a session to it.

Mikael Abrahamsson    email: swmike at swm.pp.se

More information about the ipv6-ops mailing list