TCP checksum errors

[Shawn Badger]

That was it!


Thanks


On Fri, 2006-04-21 at 17:22 -0700, Dazed_75 wrote:
> I had this experience and on researching it learned that the drivers
> for gigabit ethernet setups defer the checksum calculation to
> hardware.  So when your software tells it to send a packet, the driver
> does not compute the checksum, the chip does.  Problem is that when
> you use a capture utility like ethereal it sees the packet before the
> chip does and reports the error.  That is why it is "normal" to see
> this.
> 
> I would believe that netstat queries the hardware and that is why the
> hardware reports no errors.
> 
> On 4/21/06, Tony Wasson <ajwasson at gmail.com> wrote:
> > On 4/21/06, Shawn Badger <sbadger at cskauto.com> wrote:
> > > I am seeing TCP checksum errors on one of my servers via Ethereal. I
> > > have Googled looking for ways diagnose and correct the problem, but I
> > > have found none. I checked with  "netstat -a -i eth0" and saw no RX
> > > errors, so I am left to wonder if it is the network, the multiple
> > > servers I get the errors from or the server I am monitoring. So I am
> > > hoping someone out there can point me in the right direction.
> > >
> >
> > If you are doing your packet capture from your server, this is normal.
> > http://www.ethereal.com/faq.html#q11.1
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> 
> 
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