Why do we still need IPv4 when we are migrating to IPv6...

Steinar H. Gunderson sesse at google.com
Fri Feb 13 15:22:16 CET 2015

On Fri, Feb 13, 2015 at 02:12:31PM +0000, Phil Mayers wrote:
> As above, depends on how they're using the socket API. As a rule for
> UDP connections, you actually have to put *more* work in to see ICMP
> errors. It's certainly possible to ignore them.

FWIW, at least on Linux, if you keep doing send() on an UDP connection where
the other end sends ICMP destination unreachable, you'll get errors back
(ECONNREFUSED) eventually, although typically not on every packet you send.

/* Steinar */
Software Engineer, Google Switzerland

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