netdev - Re: [PATCH] TCP FIN gets dropped prematurely, results in ack storm

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Date:	Tue, 1 May 2007 22:20:07 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] TCP FIN gets dropped prematurely, results in ack storm

On Tue, May 01, 2007 at 11:13:54AM -0400, Benjamin LaHaise (bcrl@...ck.org) wrote:
> Hello,
> 
> While testing a failover scenario, I managed to trigger an ack storm 
> between a Linux box and another system.  Although the cause of this particular 
> ACK storm was due to the other box forgetting that it sent out a FIN (the 
> second node was unaware of the FIN the first sent in its dying gasp, which 
> is what I'm trying to fix, but it's a tricky race), the resulting Linux 
> behaviour wasn't very robust.  Is there any particularly good reason that 

One of the packets sent by broken 1.1 host has incorrect checksum, so it
will be dropped by 2.2 system in theory, could that packet somehow break
2.2 stack's state machine?

-- 
	Evgeniy Polyakov
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