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Message-ID: <47221CE4.70103@hp.com> Date: Fri, 26 Oct 2007 09:59:16 -0700 From: Rick Jones <rick.jones2@...com> To: Gaurav Aggarwal <grv.aggarwal@...il.com> Cc: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org, linux-net@...r.kernel.org, linux-kernel@...r.kernel.org, davidsen@....com Subject: Re: Bad TCP checksum error Checksum Offload on the NIC(s) can complicate things. First, if you are tracing on the sender, the tracepoint is before the NIC has computed the full checksum. IIRC only a partial checksum is passed-down to the NIC when CKO is in use. So, making certain your trace is from the "wire" or the receiver rather than the sender would be a good thing, and trying again with CKO disabled on the interface(s) (via ethtool) might be something worth looking at. Ultimately, doing the partial checksum modificiations in a CKO-friendly manner might be a good thing. rick jones - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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