Re: [mpls-linux-general] Problem with measure of network traffic

[James R. L. <jl...@mi...>]

What driver is it?  I can look in the source to see if it even supports
hardware checksumming.

Some NIC drivers have not been converted to ethtool yet, try using
mii-tool.

On Wed, Jan 18, 2006 at 07:22:21PM +0000, guilhermemtorresbase-lista@yahoo.=
com.br wrote:
> James,
>=20
> if you remember, some time ago I got a similar problem
> with ssh connections between MPLS machines.
>=20
> I've solved this problem with the command ethtool,
> turning off the checksum of my network card. Now,
> everything is ok with ssh. =20
>=20
> I don't know why I'm getting the same type of messages
> from tcpdump now, when I try to use Iperf.=20
>=20
> It seems that some cards don't accept the ethtool
> command:
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> "Cannot set device tx csum settings: Operation not
> supported"
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> I'm going to check it again
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> Best regards!
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> > There is a thread about this in the archive.  The
> > short of it is that
> > you probably have a NIC that does hardware
> > checksumming, which will not
> > work with MPLS (or any tunneling protocol).  I have
> > submitted code
> > (post 1.950) that recognizes this and turns off
> > hardware checksumming
> > for MPLS packets.  The work around for now is to
> > disable hardware
> > checksumming on your NICs.
> >=20
> > Let me know if this does not fix your issue.
> >=20
> > On Wed, Jan 18, 2006 at 05:
>=20
>=20
> =09
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> =09
> 	=09
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>=20
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>=20
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--=20
James R. Leu
jl...@mi...