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

[<gui...@ya...>]

James,

if you remember, some time ago I got a similar problem
with ssh connections between MPLS machines.

I've solved this problem with the command ethtool,
turning off the checksum of my network card. Now,
everything is ok with ssh.  

I don't know why I'm getting the same type of messages
from tcpdump now, when I try to use Iperf. 

It seems that some cards don't accept the ethtool
command:

"Cannot set device tx csum settings: Operation not
supported"

I'm going to check it again

Best regards!

> 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.
> 
> Let me know if this does not fix your issue.
> 
> On Wed, Jan 18, 2006 at 05:


	



	
		
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