[zeromq-dev] [PATCH] Additional preparation for IPv6 in 3.0

Martin Sustrik sustrik at 250bpm.com
Fri Jul 22 12:02:15 CEST 2011

On 07/17/2011 07:47 PM, Steven McCoy wrote:
> Two routes available, either "tcp" and "tcp6" like SMTP or "tcp" with
> ZMQ_PREFER_IPV4 and ZMQ_PREFER_IPV6 options like Java.  I'm going with
> the latter.

I am reviewing the patch. The new options is called ZMQ_IPV6ONLY.

With respect to RFC3493, section 5.3, I would guess the option is meant 
to disable IPv4 communication over IPv6 socket. Which implies there are 
both IPv4 and IPv6 sockets. Which in turn contradicts the text above.

Can you explain what the actual semantics of the options are?


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