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Groups > comp.os.linux.networking > #691

Re: Unusual Packet Capture Between Linux and Windows

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Billy Mays wrote:

> eth1 is the one that seems to be having the problem, while eth0 is an
> interface I know to work (just to clarify the output below). I ran
> ethtool on both of my interfaces and included only the differences
> between them. I must admit I am not familiar with specifics of what they
> do:
>
> Offload parameters for eth1:
>
> tx-checksumming: on
> scatter-gather: on
> tcp-segmentation-offload: on
> generic-segmentation-offload: on
>
>
> Offload parameters for eth0:
>
> tx-checksumming: off
> scatter-gather: off
> tcp-segmentation-offload: off
> generic-segmentation-offload: off
>
>
>
> Which of these are safe to change? Would any of these possibly be the
> source of my error?

I would try

ethtool -K eth1 tso off

tcp-segmentation-offload means that you nic is doing some of the work to 
do with tcp that the kernel netcode usually does. This could be why you 
see different dumps as tcpdump will be seeing the packets before the nic 
has segmented them.

It should be safe to turn off the others (tx sg gso) if you need to test 
further.

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Thread

Unusual Packet Capture Between Linux and Windows Billy Mays <noway@nohow.com> - 2011-10-07 12:51 -0400
  Re: Unusual Packet Capture Between Linux and Windows J G Miller <miller@yoyo.ORG> - 2011-10-07 17:08 +0000
    Re: Unusual Packet Capture Between Linux and Windows Billy Mays <noway@nohow.com> - 2011-10-07 13:23 -0400
  Re: Unusual Packet Capture Between Linux and Windows Rick Jones <rick.jones2@hp.com> - 2011-10-07 19:04 +0000
  Re: Unusual Packet Capture Between Linux and Windows Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2011-10-07 22:39 +0300
    Re: Unusual Packet Capture Between Linux and Windows Billy Mays <noway@nohow.com> - 2011-10-11 12:31 -0400
  Re: Unusual Packet Capture Between Linux and Windows Andy Furniss <spam@andyfurniss.entadsl.com> - 2011-10-08 14:00 +0100
  Re: Unusual Packet Capture Between Linux and Windows Andy Furniss <spam@andyfurniss.entadsl.com> - 2011-10-10 09:39 +0100
    Re: Unusual Packet Capture Between Linux and Windows Billy Mays <noway@nohow.com> - 2011-10-11 11:40 -0400
      Re: Unusual Packet Capture Between Linux and Windows Andy Furniss <spam@andyfurniss.entadsl.com> - 2011-10-11 20:08 +0100
        Re: Unusual Packet Capture Between Linux and Windows Billy Mays <noway@nohow.com> - 2011-10-11 20:13 -0400
          Re: Unusual Packet Capture Between Linux and Windows Andy Furniss <spam@andyfurniss.entadsl.com> - 2011-10-13 10:52 +0100
            Re: Unusual Packet Capture Between Linux and Windows Billy Mays <noway@nohow.com> - 2011-10-19 10:29 -0400

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