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I want to be able to force a socket through a specific network interface. In Linux the kernel allows a programmer to achieve this by setting said socket option - but in OS X I'm in the dark.
And hence my title question - is it possible? Has it been done? I'm not looking into re-implementing the IP stack, just enabling the usage of the bind-to-interface option.
Use the RFC 3542 interface for selecting outgoing interfaces (IPV6_PKTINFO). http://tools.ietf.org/html/rfc3542#section-6