> Before you want to change anything, make sure there actually IS a
> problem. That is, tcpdump might simply not show correct checksums
> (because packets go to bpf before the NIC sets the checksums in
> hardware), yet the packets might go out on the wire with correct
> checksums. You can't verify that on the same box at all. Run tcpdump on
> the _receiver_ (or any sniffer on that segment).
>
> Daniel
Hi Daniel,
I used ethereal on a separate box to sniff the packets on the LAN connected
to the incoming interface where the checksum error was showing (em1) to see if there
was some problem, but the packets had a good checksum. The only unknown was that I
wasn't directly connected to the interface but a switch back. It looks like an extra
line with a checksum error is being generated, either by tcpdump or by pf. From Mipam
it may be a problem with the hardware. Has this showed up before with Intel pro/1000
adapters?
Thanks,
Martin
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