On Tue, Mar 21, 2006 at 04:15:44AM +0100, Sten Daniel Sørsdal wrote: > Our first assumption was that adding DF to UDP would solve it, and it > does in our small tests, but it has a noticable negative effect on the > network.
Sounds like you need to implement Path MTU Discovery in userland for your application. In FreeBSD, PMTU-D only happens in the kernel for TCP traffic. So you would need to implement it yourself to avoid fragmentation along the path. > Are there any way i can read whether a message's packet was fragmented > into smaller pieces and preferably how large the largest fragment was? I think the MSG_TRUNC flag can tell you about this (data discarded before delivery). You'd have to experiment to see if UDP will set this flag, I'm not sure if it will. > Are there any feasible way to do this? I don't think it would be feasible to report this per datagram. Take a look at Ping Pan's paper on PF_IPOPTION if you wish to explore further. Regards, BMS _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
