>On 22 May, 12:15, Mark Janssen <mpc.jans@gmail.com> wrote:
>> On May 22, 12:46 pm, Mark Janssen <mpc.jans@gmail.com> wrote:

>> > On May 22, 12:25 pm, derek.phi@csr.com wrote:

>> > > Hi All

>> > > I had a reason to observe the communication between two scripts,
>> > > client, server,  that use tcl sockets over a network.
>> > > I used ethereal to capture packets on the server

>> > > I was supprised to see that all the packets from the server were
>> > > marked as bad, Ethereal indicates that the TCP checksum is incorrect.

>> > > I have had a look in the bug list but can't find any mention of this.

>> > > I'm not overly concerned, at the moment, as the scripts have been
>> > > working for quite some time.

>> > > I havn't looked on any other platform to see if it exists elsewhere.

>> > > Any one else seen this?
>> > > What information would need to be captured to get a better
>> > > understanding of the problem?

>> > > Setup details:

>> > > Ubuntu Linux 6.06 - with current updates
>> > > Tcl 8.4.12 - from the Ubuntu repositories.

>> > I have observed this behaviour with Ethereal before (on Sun Hardware),
>> > it might indicate that the checksums on your packets are checked in
>> > hardware and set to bogus values at the point ethereal gets to look at
>> > them.
>> > You could look at the checksums of the sent and received packages and
>> > compare them to see if they are equal. If they are not, this is
>> > probably what's happening.
>> > If your packets are otherwise correct, I wouldn't worry about this too
>> > much though.

>> > Mark

>> See also:http://www.ethereal.com/faq.html#q11.1

>> Mark
>hi

>Thanks for the info, why didn't I checkout the Ethereal page before
>hand???

>derek