Re: Setting the mss for socket
Luiz Otavio O Souza wrote: 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. this thread shoud be in FreeBSD-net@ so tha the right people see it many developers do not read hackers every day as it tends to overload them. Many thanks, Luiz ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org" ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: Setting the mss for socket
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 ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: Setting the mss for socket
"Luiz Otavio O Souza" wrote: > 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 ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: Setting the mss for socket
Patrick Tracanelli wrote: Luiz Otavio O Souza escreveu: Hello hackers, 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. you mean sysctl -w net.inet.tcp.mssdflt=512 ? ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: Setting the mss for socket
Luiz Otavio O Souza escreveu: Hello hackers, 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. I've read the code and i cannot find by myself (at least from a 30minute reading) a single point to change this. It looks like it is dynamic calculated with interface/path mtu. Someone has a simple approach to deal with this ? Any ideas ? Thanks in advance, Luiz Good point. With something like that it could be possible to make --mss switch from iperf work properly on FreeBSD. -- Patrick Tracanelli ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Setting the mss for socket
Hello hackers, 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. I've read the code and i cannot find by myself (at least from a 30minute reading) a single point to change this. It looks like it is dynamic calculated with interface/path mtu. Someone has a simple approach to deal with this ? Any ideas ? Thanks in advance, Luiz ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
