Internet connection sharing between Mac Mini and Imac G3- how?

Ok, I'm trying to connect my G3 Imac (running 10.4.8) to my Mac Mini (also running 10.4.8) but it just wont work.
I've turned Internet Connection sharing on on my Mac Mini, and set it to share the airport connection to computers connected using Built in ethernet.
Network (on the M Mini) shows
Built-In Ethernet is currently active. Built-In Ethernet has a self assigned IP address and may not be able to connect to the Internet.
Network (on the G3) shows
Built-In Ethernet is currently active and has the IP address 192.168.2.7. You are connected to the Internet via Built-In Ethernet.
When i try to go to a webpage on the G3 it fails stating, 'You are not connected to the Internet'.
I'm using a standard straight through ethernet cable, as I was told a while ago from apple support that it doesn't matter which u use, straight through or crossover.
Any help would be really appreciated
Macbook 2.0Ghz 2GB 80GB/Mac Mini 1.42Ghz 1GB 80GB/Imac G3 450Mhz 640MB 80GB   Mac OS X (10.4.8)  

OK after some playing about I can now manage to connect to the mac mini and vice versa to share files.
The iMac G3 now says it has an IP address of 192.168.2.18, and that it's connected to the internet via built-in ethernet. I've set configure IPV4 to Using DHCP.
Except it's not connected to the net.
If i select Using DHCP on the Mini it doesn't obtain an IP address, not even a self set one. So i've set a manual IP address on that, and everything shows up green. Airpot connected to the internet and Ethernet has an IP address of 192.168.2.30.
After reading some forums I set up firewall logging. The result is what happens on the Mac Mini when I use network diagnostics on the G3:
Feb 11 16:43:52 richard-xxxxx-mac-mini natd[394]: failed to write packet back (Host is down)
So I opened port 394 (not really knowing what i'm trying) but it had no effect.

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