Wireshark · Wireshark-users: Re: [Wireshark-users] Looking for some help or advice with an issue

[Charles.Neff@xxxxxxxxxx]

Not using any EtherChannels.  The
thing that seems troubling to me is the fact that using the same equipment,
server, and programs, plain telnet traffic shows up just fine, both directions.
 The only difference between this case and the one where I have issues
is the POS program that is running on the server.  Could it be changing
the packets in any way that would cause them to not be picked up by WireShark?
 and if so, what is it changing them to, and how can it be fixed?

_charley

Alan Emery <ademery@xxxxxxxxxx>
Sent by: wireshark-users-bounces@xxxxxxxxxxxxx

04/08/2008 04:15 PM

Please respond to
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Subject	Re: [Wireshark-users] Looking for some help or advice with an issue

Scanning through the information sent so far raises the
question of whether you are using some type of EtherChannel bundling for
uplinks. If so, and you are only spanning one of the links in the bundle
to your Wireshark port, you might see the behavior identified. Depending
on the algorithm in use by the switch, you might see traffic in one direction
on the link you selected, and not traffic in the opposite direction. If
the algorithm does any kind of dynamic allocation, it may explain why it
appears that devices are coming and going as they are allocated or removed
from the link in the bundle you are watching. 

Verify whether you are using a EtherChannel bundling path technology on
the switch you are monitoring. If so, you need to monitor all the pipes
in the bundle, but watch out for oversubscription of the monitor port you
have attached Wireshark to.

Alan Emery

Global Solution Center 
1177 S Beltline Road, Coppell, TX 75019 
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