netdev - Re: What causes these TCP packet getting lost in linux kernel

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Message-ID: <CAMRd1sWa70D3Cjx74jC8g2fJKXho=okrpu+HfsZmu77-70c4DQ@mail.gmail.com>
Date:	Mon, 14 Apr 2014 17:20:08 +0800
From:	chptx y <chptxy@...il.com>
To:	David Newall <davidn@...idnewall.com>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: What causes these TCP packet getting lost in linux kernel

i don't know why, no matter I capture packets on my Ubuntu PC or
Android device with tcpdump,  open the output file with wireshark, all
output packets are marked with "incorrect checksum", but it seems that
this problem don't affect  subsequent packets interaction. why?

2014-04-14 16:39 GMT+08:00 David Newall <davidn@...idnewall.com>:
> It's interesting that all of the packets from source port 34865 to
> destination port 80 have invalid checksums.  The hint, that it could be a
> TCP offload engine, doesn't sound entirely believable because some value is
> being calculated and stored, not just a fixed or random value; and as the
> destination is port 80, I'm guessing that these the packets from your
> Android device, which probably doesn't have a TCP offload engine.
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