Mike Just a thought, but have you tried setting a gns-response-delay on your router. From what I remember reading in my support exam study (I have NO ipx experience), this can be used to "compensate for the slow CPU or network adapter card of the client, which would otherwise miss a quicker response".
It just seems from your other emails that this may match your symptoms and perhaps the difference between connecting to switch a vs switch b is just a tiny bit of latency that is enough to allow the old machines / cards to get the response. Like I said, I have no IPX experience and this is just a shot in the dark based on something I remember reading. Regards Peter Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=48030&t=47951 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]