Wireshark mailing list archives
Re: Large Packages although TSO is off
From: Martin Visser <martinvisser99 () gmail com>
Date: Mon, 27 Sep 2010 12:31:04 +1000
The only thing I am wondering is whether you have turned off "tcp segmentation offload" at the physical level of the server, but it is still on at the virtual machine guest level. (You haven't said you are running in virtualised environment, but I had this issue). Do you think this is causing a network operation issue, or is just that wireshark isn't showing the data you expect? Regards, Martin MartinVisser99 () gmail com On Fri, Sep 24, 2010 at 11:35 PM, Estanislao Gonzalez < estanislao.gonzalez () zmaw de> wrote:
Hi, I've been reading a lot lately, but I still can't find the source of my problem. For example this is a captured package at eth0: 6249 10.090368 remote.ip local.ip TCP 51402> 50383 [ACK] Seq=56628006 Ack=1578 Win=9216 Len=18824 TSV=240912663 TSER=21362093 These are the current settings: # ethtool -k eth0 Offload parameters for eth0: Cannot get device udp large send offload settings: Operation not supported rx-checksumming: on tx-checksumming: on scatter-gather: off tcp segmentation offload: off udp fragmentation offload: off generic segmentation offload: off generic-receive-offload: off (I've already tried turning checksumming also off) The TCP options are set to avoid reassembling streams and not to validate checksums. If MTU is set to 9000 for the receiver, and 1500 for the sender, why am I still seeing large packages? Any idea? Thanks, Estani -- Estanislao Gonzalez Max-Planck-Institut für Meteorologie (MPI-M) Deutsches Klimarechenzentrum (DKRZ) - German Climate Computing Centre Room 108 - Bundesstrasse 45a, D-20146 Hamburg, Germany Phone: +49 (40) 46 00 94-126 E-Mail: estanislao.gonzalez () zmaw de ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org ?subject=unsubscribe
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Current thread:
- Large Packages although TSO is off Estanislao Gonzalez (Sep 24)
- Re: Large Packages although TSO is off Martin Visser (Sep 26)
- Re: Large Packages although TSO is off Estanislao Gonzalez (Sep 27)
- Re: Large Packages although TSO is off Martin Visser (Sep 27)
- Re: Large Packages although TSO is off Estanislao Gonzalez (Sep 27)
- Re: Large Packages although TSO is off Martin Visser (Sep 26)