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Open Source and information security mailing list archives
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Date: Sun, 23 Sep 2007 23:18:58 +0200 (CEST) From: Krzysztof Oledzki <olel@....pl> To: Herbert Xu <herbert@...dor.apana.org.au> cc: netdev@...r.kernel.org Subject: Re: incorrect cksum with tcp/udp on lo with 2.6.20/2.6.21/2.6.22 On Sun, 23 Sep 2007, Herbert Xu wrote: > Krzysztof Oledzki <olel@....pl> wrote: >> >> It seems that after some not very recent changes udp and tcp packes >> carring data send by a loopback have incorrect cksum: > > This correct. The loopback interfaces has the no checksum flag > set so we only provide a partial checksum on output (i.e., the > pseudoheader without the payload). > > We even export this to user-space via a flag. So you should fix > tcpdump to read this flag and ignore the checksum. Thank you for the information. Is there any easy way to turn them on? I need it for LVS. Best regards, Krzysztof Olędzki
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