If you’re not allowed to have a router, but you are allowed to have a switch that you can connect your clients and the FOG server to, dhcp from the FOG Server will still work.
The web gui should be accessible in one of two ways. As long as httpd/apache services are running, you can access the web gui by the IP address of the fog server (e.g. [url]http://192.168.1.10/fog[/url]) or by using localhost address (e.g. [url]http://127.0.0.1/fog[/url] OR [url]http://localhost/fog[/url])
Another avenue, if your network guys will allow it, is to setup proxyDHCP. This way you don’t have to change any of the network currently setup and you wouldn’t need, if I understand it correctly, to install dhcp server on the FOG server.
[url]http://www.fogproject.org/wiki/index.php/Setting_up_ProxyDHCP[/url]
Basically what ProxyDHCP does is listen for clients trying PXE and if it hears a request, it sends the client the information necessary to PXE Boot without having to modify the network at all. No options 66/67, no router, no dhcp server, etc… Which sounds to me like the case you’re running into here.