On January 19, 2014 at 16:24, Mario said...
IT was always going to use a Watchguard. I don't have a specific model, but it looks like
Watchguard XTM 515 - WG515001 or higher.
I'm still unsure how I could take advantage of the other 3 addresses,
Also, if single router can be configured to accept multiple WAN addresses, can I use single WAN port or does each IP address need to have it's own plug?
I suppose it depends on the router. The ones I use allow setting up multiple "logical" WAN ports that share the single physical WAN port.
You can also just pass them through the firewall (no NATing) into a "DMZ" and use them for "public" servers. Instead of setting up port forwarding rules to access servers on the LAN from the outside world you can just access the servers directly using the IP addresses, one per server.