From: YOSHIFUJI Hideaki / 吉藤英明 <[email protected]>
Date: Tue, 22 May 2007 18:36:47 +0900 (JST)
> In article <[email protected]> (at Tue, 22 May 2007 10:57:38 +0200), Eric Dumazet <[email protected]> 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.
It is clear we should disable TSO for sockets making use of TCP-MD5.
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