Date: Thu, 16 Sep 2004 04:10:46 -0000 From: Hendrik Scholz <hscholz@raisdorf.net> To: pf4freebsd@freelists.org Subject: [pf4freebsd] Re: Strange problem/Need help Message-ID: <41036498.70705@raisdorf.net> In-Reply-To: <200407230602.34822.max@love2party.net> References: <200407230602.34822.max@love2party.net>
next in thread | previous in thread | raw e-mail | index | archive | help
Hi!
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
hardware?
[0.27] hscholz@deimos:~ > ifconfig xl0
xl0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
options=9<RXCSUM,VLAN_MTU>
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,
Hendrik
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?41036498.70705>