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Date: Fri, 11 Nov 2011 07:52:30 -0500
From: Jim Rees <rees@umich.edu>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>,
        Chuck Lever <chuck.lever@oracle.com>,
        linux-nfs <linux-nfs@vger.kernel.org>
Subject: Re: unexpected NFS timeouts, related to sync/async soft mounts over
 TCP
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Andrew Cooper wrote:

  As for TCP timestamps; I have a Timestamp option in each TCP packet. 
  Nothing appears corrupted.  What would I be looking for with corrupted
  timestamps?

I had a faulty NAT once that was changing the ts ecr in the syn ack packet,
causing the other end to send rst.  I can't remember if wireshark flagged
this as bad or I found it manually.  I do remember that there was no log
message from the linux kernel.  I'll bet there's some tool that will read a
pcap and verify the timestamps.