v6 connection refused for AS112 webserver

Mike Jones mike at mikejones.in
Thu Jan 3 16:41:36 CET 2013

On 3 January 2013 15:13, Steinar H. Gunderson <sesse at google.com> wrote:
> 2013/1/2 Mikael Abrahamsson <swmike at swm.pp.se>:
>> 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.
> You still get the extra round-trip, though, but it's nowhere near what
> you'd get with broken IPv6 (and no HE).

If you have broken v6 then you're going to have the same problem
receiving the SYN+ACK for working dual stack sites.

- Mike

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