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Open Source and information security mailing list archives
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Date: Sun, 23 Sep 2007 12:39:36 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: olel@....pl (Krzysztof Oledzki) Cc: netdev@...r.kernel.org Subject: Re: incorrect cksum with tcp/udp on lo with 2.6.20/2.6.21/2.6.22 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. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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