[pf4freebsd] Re: Strange problem/Need help
hscholz at raisdorf.net
Wed Sep 15 21:10:46 PDT 2004
Max Laier wrote:
> It turned out (after days of brainwracking debugging) that
> the problem went away by disabling the i386 optimized version of in4_cksum().
Did you take into account that certain network cards do checksums in
[0.27] hscholz at deimos:~ > ifconfig xl0
xl0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
bge(4) and other good 10/100 and Gbit cards do even more so if the
TXCSUM option is enabled bpf sees packets with broken checksums as these
are calculated by the NIC itself before sending.
Just my $.02,
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