I have a Sonicwall Pro4100 that I have setup on my LAN which is running only as our gateway/firewall. The LAN connects to this Sonicwall through one of the 9 configurable ports.<BR><BR>My problem is ...

I'd just create a new VLAN, and let the switches do their L3 thing. It should work just fine. Put the VLAN onto the production 5510 port that the fiber connects to, this will prevent unnecessary ...