i have 2 network, each has its own internet connection. it is on my netcafe, 1st is for browsing and 2nd for online gaming. How do i connect them 2 my pc billing server.
IF your two networks are completely independent, in hardware, configuration, subnets, etc. Then you have to do some work and make some decisions on how you want to do this. As I see it, an ideal solution would be to use two network connections to your server. One from each LAN. You'll have to make sure that the IP address and subnet for each NIC on the server is setup for the correct LAN, and you won't be able to use the same IP addresses for each network. The computers can connect to the server either by IP address, or a forward from your router (if it supports this).
Using the server as a default gateway won't work if the server isn't setup for it, and it increases the lag and congestion of both networks through a common link. Additionally it creates a single point of failure. If the server goes down for any reason, both networks stop instantly until the server comes back up.
Current connections through the captave portal keep working, and my customers go on surfing until their time is up - blissfully unaware of the hiccup in my server. Any new customers will have to wait for the re-boot.
If the server were the gateway / proxy, everything would come to a grinding halt.