'Official' ethernet library and board

I want to limit the interaction of clients talking to an Arduino web server. Specifically, I want to check the subnet mask against incoming clients addresses and make sure they on have limited access. However, the library doesn't seem to supply the incoming ip address. Is there a way?

Yes, I tried searching but I couldnt' limit the responses to anything meaningful. Also, I have a nice firewall and NAT setup that isolates the device from outside really well, but when you get to the actual device there could be problems. Since this is an arduino and not a big ol web server the concept of sessions, passwords and such are a bit much for the little guy.

So, anybody know a way to get the incoming address?

Nevermind, I was searching for something completely different and found my answer!

http://arduino.cc/forum/index.php/topic,54378.0.html

Sometimes you get way too much information from a web search.