Hello,

We are restricting non-authorized access on our network. I've been able to "lock down" the DHCP server to only allow specific hosts (determined by their MAC address). I'm in the process of creating a small pool of DHCP addresses that unknown-hosts will be able to access, but only redirects them to a very restrictive network with a lighttpd webserver offering a static page explaining what they need to do to gain access to our network. It's not full (fool?) proof, but it's fairly solid.

The problem is, how can I restrict static IPs? The easiest way to circumvent any of the above is to just supply static network info (easily found on any workstation on the network) and bam! You have full access.

A description of our network:
We use Foundry routers and switches and Cisco switches on our network. The DHCP server is ISC's DHCP 3.1.0 running on Gentoo. We have separate VLANs for several networks (13 total) running through the switches/routers. The main firewall is on a Foundry router. Our workstations are mostly XP, but we have some Vista, a handful of Macs, and a few Linux.

Any thoughts?

-Chad

What I have seen in other places, not sure how its done in *Nix but look into reservation by MAC address and block those out to some obfuscated address like AA:AA:AA:AA:AA:AA or 11:11:11:11:11, something of that nature.

Thanks! I think I'm probably going to be using IPTables to do something similar to that. My obstacle so far is that we are using a Foundry router as our firewall and not an IPTables based linux system, so there isn't really a system that "all traffic" passes through that is running Linux. I may implement something like that though if I can't figure out another way around it. The Foundry router (as far as I can tell) doesn't support MAC restrictions, at least not in the way I was hoping it would (parse out an auth file containing MAC addresses). If I were to place a Linux box on each VLAN (or at least an ethernet port for each VLAN, maybe connected to a single server) that all traffic would pass through before hitting the router I think I'd be set...

Thanks again,

-Chad