netdev - Re: [BUG bisected] 2.6.30.4: NET: active FTP doesn't work

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Message-ID: <4A952FCB.6010101@trash.net>
Date:	Wed, 26 Aug 2009 14:51:23 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Vitezslav Samel <vitezslav@...el.cz>
CC:	Krzysztof Piotr Oledzki <ole@....pl>,
	Greg Kroah-Hartman <gregkh@...e.de>, netdev@...r.kernel.org
Subject: Re: [BUG bisected] 2.6.30.4: NET: active FTP doesn't work

Vitezslav Samel wrote:
> 	Hi!
> 
>   When testing 2.6.30.4+ kernel, I discovered active ftp does not work
> anymore (2.6.30.3 is OK).
> 
>                LAN              internet
>    machine1  -------  router1   -------   machine2
> 
> 
>  Active ftp from machine1 to machine2 connects, transfers some files and
> then hangs. Passive ftp works OK. The faulty box (router1)
> is router/firewall and is doing NAT.
> 
>   I bisected it down to commit 7500f93f415a2fc07e0031d99fa3964bf8981cfc
> in linux-2.6.30.y tree ("netfilter: tcp conntrack: fix unacknowledged
> data detection with NAT").
> 
>   Could you, please, take look at it?

Please send me a tcpdump (binary dump, with -o <file> and -s0) of an
FTP session on both the internal and external interfaces and your NAT
rules. Thanks.
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