netdev - Re: A SACK block to the left of the ACK? (with ptr to raw trace)

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Date:	Fri, 09 May 2014 15:18:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	rick.jones2@...com
Cc:	johnwheffner@...il.com, netdev@...r.kernel.org
Subject: Re: A SACK block to the left of the ACK? (with ptr to raw trace)

From: Rick Jones <rick.jones2@...com>
Date: Fri, 09 May 2014 11:25:11 -0700

> On 05/09/2014 11:21 AM, John Heffner wrote:
>> I didn't actually look at the trace, but offhand this sounds like
>> D-SACK. (http://www.ietf.org/rfc/rfc2883.txt)
> 
> Thanks for the gentle tap with the clue-bat :)

Indeed, it's probably a D-SACK and can be used to let the sender
know when a retransmit turned out to be spurious.
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