Hello!
> >IP_PKTOPTIONS, but it is implemented only for IPv6.
> >
> >Well, I know no useful applications of this feature in any case.
>
> That option would be useful to solve one of the problems of multi homed
> UDP services - which interface did the packet come in on?
This feature for datagram sockets is really necessary and, hence,
it DOES exist. The speech was about TCP, where it is difficult
even to formulate the problem unambiguously.
Alexey
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