On Wed, Sep 05, 2007 at 09:45:04AM +0200, Renaud Allard wrote: > Hello, > > I just have two Dell servers having broadcom netXtreme NICs with tcp offload > engine activated (and locked on on) in the bios. > I tried to use these servers to do an smtp gateway with spamd. When I > activated > spamd, connecting to port 25 worked but nothing more. After scanning with > tcpdump, I saw that all packets passing through pf going to spamd and exiting > had bad tcp checksum. The machine at the other end receiving these bad tcp > checksum of course dropped them. For the moment, I solved the issue by using > Intel em NICs. > Packets passing not passing through pf had also about 50% packets with bad > checksum too.
Sounds like the same thing I ran into. http://cvs.openbsd.org/cgi-bin/query-pr-wrapper?full=yes&textonly=yes&numbers=5437 As mentioned by others, checksum offload is disabled in CURRENT (as of 2007-07-04). A diff follows if you need a patch for 4.1 stable. -Paul Index: if_bnx.c =================================================================== RCS file: /cvs/src/sys/dev/pci/if_bnx.c,v retrieving revision 1.48 diff -u -r1.48 if_bnx.c --- if_bnx.c 5 Mar 2007 11:13:09 -0000 1.48 +++ if_bnx.c 5 Sep 2007 13:46:53 -0000 @@ -875,8 +875,7 @@ bcopy(sc->eaddr, sc->arpcom.ac_enaddr, ETHER_ADDR_LEN); bcopy(sc->bnx_dev.dv_xname, ifp->if_xname, IFNAMSIZ); - ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_CSUM_TCPv4 | - IFCAP_CSUM_UDPv4; + ifp->if_capabilities = IFCAP_VLAN_MTU; #if NVLAN > 0 ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING;
