OS X Server 10.4.7 as router to internet

Hello,
I am trying to set up a gateway to the internet through my g5 server. I have tried the gateway setup assistant but it doesn't really do what i need it to do.
I already have a DHCP server and DNS running on the AD that the servers are integrated into.
I need to be able to set up a connection between two cards that are using two different ranges but the same subnet ie 192.168.0.0 and 172.18.0.0. I have configured the two cards as follows:-
en0 (Internal) -
ip: 192.168.1.1
subnet: 255.255.255.0
router: 192.168.1.1
DNS pointing to the AD servers.
en1 (external)-
ip: 172.18.0.2
subnet: 255.255.255.0
router: 172.18.0.1
DNS pointing at the AD servers.
Once this has been configured i then need to set up nat and firewall rules to allow internet access but also need to set up a proxy server with authentication.
How would i go about completing these tasks.
Thanks for any help in advance.

Hello Camelot,
thanks for giving a hand. On the third point you say to
"3) change the router at 172.18.0.1 to route 192.168.1.x via 172.18.0.2 - in this way the router will send any traffic for 192.168.1.x to the external interface of this server, which will pass it through."
Unfortunately i do not have access to the settings on our external router. I can only change internal settings for the remainder of the network. Is there any way to do the last part internally?
i think i have something up and running but not too sure of its efficiency.
I have moved the external connection to the top of the list on network configs.
I have set a firewall rule for the 172.18 range and set it to allow all traffic. ( i thought since there is another nat router after this is should be ok).
I have set nat service to translate and forward requests on the external port.
I removed the router address from the internal command and added the proxy address to the external.
I just need to confirm all is working correctly from the client-side.
PS what would be the best authenticating proxy at the moment? Free is obvioulsy best.
I have starrted to look at dgcomplete but i lacks authentication at the moment. Any pointers to a config build for squid and dansguardian including authentication would be ace.
Thanks in advance.

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