I would put the server as the first thing in your network (with the firewall on of course!) and then run another CAT from your xserve to the router (you have two ports right?). Turn DHCP on as a service in the server and turn off the DHCP feature on your router, making it into an access point (or switch if not wireless).
This way, you will have total control over the GRE (General Routing Encapsulation), not just the ports, which is often lacking on routers.
You wouldn’t run into any problems (i think) other than an improperly configured firewall. Block everything and then only open the ports you absolutely need.
Make sure the firewall is running before you change over!!!!!!
Hope this helps,
Robert
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