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Date:	Wed, 23 May 2007 10:33:16 +0000
From:	"Thomas B. Rücker" <>
To:	Herbert Xu <>
Subject: Re: UDP checksum broken since 2.6.18?

Herbert Xu wrote:
> "Thomas B. R??cker" <> wrote:
>> Stephen Hemminger wrote:
>>> The packet passed to packet capture programs may not have a valid checksum
>>> if you have checksum offload configured on the device.  What kind of hardware
>>> do you have on sender and receiver? 
>> The c-snippet uses 127.x.x.x --> loopback
> We never compute the complete checksum for loopback so that explains
> the bogus checksum.
Does this also explain why wireshark thinks the checksum is right when
tested on <=2.6.17?


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