@SamK
Make sure, once you configured the Gateway as 192.168.2.1, you go into your DHCP server and instead of choosing "Custom", choose "Configured Ones" and select the one you just setup in there earlier today.
That is JUST IN CASE you change your gateway's IP. If you do change it, you have to change it in eBox too right? Well now you don't have to change it in your DHCP server, you just change it in the Gateway area only. It is one less place to change it. That is what sixstone meant.