6.0 BETA-3, if_bridge and invalid TCP checksum

Jon Passki cykyc at yahoo.com
Wed Sep 14 15:09:22 PDT 2005

Hello All,

I'm running 6.0 B3 and noticed TCP checksum errors while using the
if_bridge functionality.  Disabling the onboard checksum function
on the NIC stopped the errors.  As a note, the TCP checksum put
into the packet was only the checksum (without the final inversion)
of the pseudo TCP header as described in RFC 793.  Here's info on
the card:

dmesg | grep em0                                                   

em0: <Intel(R) PRO/1000 Network Connection, Version - 2.1.7> port
mem 0xf2300000-0xf231ffff irq 18 at device 1.0 on pci1             
em0: Ethernet address: 00:30:48:84:01:22                           
em0:  Speed:N/A  Duplex:N/A   

I'd be happy to try out any patches if someone knows what's going


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