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

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Date:	Tue, 1 May 2007 22:07:08 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	John Heffner <jheffner@....edu>,
	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 02:04:05PM -0400, Benjamin LaHaise (bcrl@...ck.org) wrote:
> I know it's a bug, and I'm trying to fix it, but that doesn't change the 
> fact that A) the system is already deployed and B) Linux is not retransmitting 
> the FIN, which (from Linux's point of view) remains unacknowledged by the 
> other side.  The patch might be wrong, but the goal of fixing the behaviour 
> isn't.

It does retransmit fin:

10:23:32.298477 IP (tos 0x0, ttl 255, id 39972, offset 0, flags [DF],
proto: TCP (6), length: 52) 192.168.1.1.59192 > 192.168.2.2.bgp: F,
cksum 0x5558 (correct), 1562038077:1562038077(0) ack 2624175183 win 183
<nop,nop,timestamp 1549356119 781231>
10:23:32.599809 IP (tos 0x0, ttl 255, id 39973, offset 0, flags [DF],
proto: TCP (6), length: 52) 192.168.1.1.59192 > 192.168.2.2.bgp: F,
cksum 0x542b (correct), 1562038077:1562038077(0) ack 2624175183 win 183
<nop,nop,timestamp 1549356420 781231>
10:23:33.201722 IP (tos 0x0, ttl 255, id 40802, offset 0, flags [DF],
proto: TCP (6), length: 52) 192.168.1.1.59192 > 192.168.2.2.bgp: F,
cksum 0x51d1 (correct), 1562038077:1562038077(0) ack 2624175183 win 183
<nop,nop,timestamp 1549357022 781231>
10:23:34.405537 IP (tos 0x0, ttl 255, id 40914, offset 0, flags [DF],
proto: TCP (6), length: 52) 192.168.1.1.59192 > 192.168.2.2.bgp: F,
cksum 0x4d1d (correct), 1562038077:1562038077(0) ack 2624175183 win 183
<nop,nop,timestamp 1549358226 781231>


-- 
	Evgeniy Polyakov
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