Setting the mss for socket

[Luiz Otavio O Souza]

>> Is there a way to set the mss for a socket ? Like you can do
>> in linux with setsockopt(TCP_MAXSEG) ?
>>
>> So i can set the maximum size of packets (or sort of) from a
>> simple userland program.
>
> Depending on exactly what you need to accomplish, you may
> find something useful in this thread from last August in
> freebsd-questions@
>
>  setting the other end's TCP segment size

Very informative thread, thanks.

This thread show me that TCP_MAXSEG is implemented in freebsd but don't
work. You can set the setsockopt(IPPROTO_TCP, TCP_MAXSEG), wich will set the
tp->t_maxseg, but this value is recalculated at tcp_input, so in short, you
cannot set the max segment size for a socket.

I've posted a completly wrong patch (from style point-of-view - and using
SOL_SOCKET instead of IPPROTO_TCP), but with that patch i'm able to set the
mss in iperf.

Many thanks,
Luiz