netdev - Re: TCP_MD5 and Intel e1000

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Message-ID: <4652B227.60404@lemonia.org>
Date:	Tue, 22 May 2007 10:04:39 +0100
From:	Dunc <dunc@...onia.org>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	Marc Donner <webmaster@...eraudio.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: TCP_MD5 and Intel e1000

Eric Dumazet wrote:
> On Tue, 22 May 2007 09:33:29 +0200
> Marc Donner <webmaster@...eraudio.de> wrote:
> 
>> Hi,
>>
>> I have tried to set up quagga with tcp-md5 support from kernel. All seems ok
>> with a intel e100 NIC, but as i testetd with a intel e1000 NIC the tcp
>> packets have an invalid md5 digest.
>> If i run tcpdump on the mashine the packets are generated, it shows on the
>> outgoing interface invalid md5 digests.
>> Are there known issues about tcp-md5 and e1000 NICs?
>>
> 
> Hi Marc
> 
> CCed netdev as more appropriate to discuss about network stuff.
> 
> Would be nice if you sent some tcpdump samples to share with us, and tell us
> which exact linux version you tried.
> 
> You could try "ethtool -K tx off", and/or other ethtool -K settings
> 
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I had this with e1000 NICs and it was just because I had TSO on.

It is disabled with ethtool as Eric suggests

Cheers,

Dunc
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