linux-kernel - Re: TCP_MD5 and Intel e1000

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Message-Id: <20070522.183647.75785266.yoshfuji@linux-ipv6.org>
Date:	Tue, 22 May 2007 18:36:47 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	dada1@...mosbay.com
Cc:	webmaster@...eraudio.de, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org
Subject: Re: TCP_MD5 and Intel e1000

In article <20070522105738.f03cb83b.dada1@...mosbay.com> (at Tue, 22 May 2007 10:57:38 +0200), Eric Dumazet <dada1@...mosbay.com> says:

> > 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?
:
> You could try "ethtool -K tx off", and/or other ethtool -K settings

Disabling offloading should help; currently tcp-md5 stack
blindly copy md5-signature from the first segment
which is not appropriate for rest of segments.

--yoshfuji
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