I tried to set up the following scenario: ZeroShell box behind a router with one interface which directly gets a dynamic ip from a router which has the ip 192.168.1.1 (I know this does not really make a lot of sense but it is just a testing environment).
The outgoing interface is ETH0 and gets the ip 192.168.1.15 from the previously mentioned router over DHCP.
The other interface ETH1 should be the one where I plug my network to. So I enabled the NAT on the ETH0 interface. Now setting up the default gateway does not really work since I know that it is 192.168.1.1 but the GUI wouldn’t accept it. Has anyone an idea how I could possibly set this up correctly?