How to check TCP Offloading via tcpdump

gurl4sh25 · 02-05-2012, 09:41 PM

Hi Experts,

Does anyone know how to check tcp offloading issues via tcpdump?

Please note that, I do know how to disable tcp offloading and I know how to use ethtool, I just want to know how to check it via tcpdump command

unSpawn · 02-06-2012, 04:42 PM

See http://wiki.wireshark.org/CaptureSetup/Offloading and search for odd delays between client data and server response you wouldn't have with offloading disabled?

jefro · 02-06-2012, 04:43 PM

I don't see it as a choice. I hope this isn't a trick question. I guess the answer would be to compile your own version of the tool that added in that feature.

It may be possible to assume it. I think on offloading there is always a bad checksum at the OS since the nic did it and doesn't report that.

gurl4sh25 · 02-07-2012, 04:59 AM

Thanks for the reply Guys, based on your answers it seems it is not possible to do it on tcpdump =)

jefro · 02-07-2012, 03:22 PM

I think both of us pointed out the issue of the failed checksums.