If I get you right you are useing a 3g Internet connection and have a router wich conets the 2 computers together, the problem is that you can't share the internet connection.
Without any information about the operateing systems I can tell you the idea:
First you need to disable DHCP server on the router and use static IP addresses on both PC, the IP address should be something like
PC1:
IP: 192.168.0.2
Network mask:255.255.255.0
PC2:
IP: 192.168.0.3
Network mask: 255.255.255.0
Default gateway: 192.168.0.2
In this IP configuration above PC1 has the 3g modem connected.
This was the easy part, hard part is to share the internet connection on the network, that's a little different ritual on every operateing system, try to use google to get your specific one.
However there's a much more easier way to solve all your problems if you can't make it work, but it costs money. All you need to buy is a 3G router and that will do the same thing for you what your old router did.
I did a little search for you on Australian Ebay to see what you can get.But I'm sure you have your own cheapbfavourite source of computer hardware as well.
Hope this will help you sorting out your porblem.
Regards
Imre
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