v6 connection refused for AS112 webserver

Steinar H. Gunderson sesse at google.com
Thu Jan 3 16:13:56 CET 2013

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).

/* Steinar */
Software Engineer, Google Switzerland

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