netdev - Re: [Bugme-new] [Bug 8042] New: Cisco VPN Client cannot connect using TCP with Intel 82573L NIC

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Date:	Mon, 19 Feb 2007 22:27:38 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>, johnf@....ca
Subject: Re: [Bugme-new] [Bug 8042] New: Cisco VPN Client cannot connect
 using TCP with Intel 82573L NIC

On Mon, 19 Feb 2007 15:55:19 -0800 bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=8042
> 
>            Summary: Cisco VPN Client cannot connect using TCP with Intel
>                     82573L NIC
>     Kernel Version: 2.6.18.6
>             Status: NEW
>           Severity: normal
>              Owner: shemminger@...l.org
>          Submitter: johnf@....ca
> 
> 
> Most recent kernel where this bug did *NOT* occur: -
> Distribution: Ubuntu, Debian
> Hardware Environment: Lenovo Thinkpad T60p
> Software Environment: -
> Problem Description:
> 
> I have an issue with the cisco vpn client
> (vpnclient-linux-x86_64-4.8.00.0490-k9.tar.gz) that appears to be related to
> packet fragmentation and the e1000 driver (hardware is 82573L, I don't believe
> that this issue affects earlier chips).
> 
> When I try to connect to a VPN using Cisco's TCP tunneling feature I experience
> an issue where I am unable to connect to the vpn concentrator.
> 
> If I recompile the e1000 module, setting the option:
> 
> CONFIG_E1000_DISABLE_PACKET_SPLIT=y
> 
> then I am able to connect without issue.
> 
> I have experience this problem with the following kernels:
> 
> ubuntu edgy 2.6.16-11-generic
> debian sid  2.6.18-4-686 (Based on 2.6.18.6 w/hand picked later patches)
> kernel.org  2.6.18.6
> 
> There was a perhaps related bug resolved for udp recently, see this changelog entry:
> 
> http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=753eab76a3337863a0d86ce045fa4eb6c3cbeef9
> 
> You can also see some discussion surrounding the issue (I had initially believe
> it related to another issue with the 82573L), starting from this comment:
> 
> http://bugzilla.kernel.org/show_bug.cgi?id=6929#c9
> 
> Please let me know if there is anything else I can do to better explain the problem.
> 
> Steps to reproduce:
> 
> It's not possible to reproduce this issue without:
> 
>  - A 82573L chip based network card
>  - A Cisco VPN Concentrator you can access using TCP tunneling
>  - The cisco vpn client ()
> 
> I have all of these, and would be more than pleased to reproduce the problem,
> provide packet captures, etc... If you want to reproduce the problem yourself,
> and have the above equipment, try to open a TCP encapsulated connection to the
> VPN Concentrator, you should not be able to unless you have compiled e1000 with
>  CONFIG_E1000_DISABLE_PACKET_SPLIT=y.
> 
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