I have a router that has 5 static ip addresses set on it. These external static IP's are mapped to internal IP's on our LAN. We currently have no firewall or proxy set up, so I cannot monitor user bandwidth usage or block content.
I have set up an Ubuntu firewall with 2 network cards and Squid proxy and am able to connect to the internet via the firewall from a workstation within the LAN.
I am also familiar with port forwarding through the Ubuntu firewall, however, how can I map an external IP address to an address on the internal IP ? The router has a static IP address on the LAN (192.168.0.2), my Ubuntu Firewall has a static IP address of 192.168.0.3 on the "WAN" network card and an address of 10.10.10.1 on the "LAN" network card. My clients on the LAN are within the address range of 10.10.10.1 - 10.10.10.255.
Any help would be appreciated.