To get the Static IP Settings, all you need is Default Gateway and Subnet mask. You can assume most of this info from just the Routers IP...

But, i'd like to point out BN's post about Layered Security....

If some kid came across this aswell as a hundred other security layers, he's going to give up. Once he's in your just making his life more difficult and knocking out another group of people who dont know how IP's work.

if you are on the 172.18.23.0/30 Subnet, how many hackers actually know which IP to set so they can get online ? Then they need DNS info. its a layered approach, that with planning can be added to be more of a 'pain in the ass wireless network' - Its not adding security, its just like adding another window that they have to climb through that they thought wasnt there.

I'd do it just to be a pain in the ass :P but thats just me :)