Slow network connectivity

Our environment is a hybrid with a novell 6 server and 3 windows 2003 servers. All clients are windows XP with novell client 4.9 SP2.

The problem we are running across can only be explained as a very limited connectivity to any resources on the novell server. The problem is not specfic to any particular hardware on the clients nor is it any particular time of day(i.e. early morning logon or midday logon). I have run Ethereal on several machines to try and see if perhaps it was an ARP brodcast problem but that is not the case. I am hoping to find someone that has run across a similar problem. thanks for any input