Can I set my IP have a different range from the gateway?

[nhatminh1209]

I have a problem. I want to set my IP to have a different range from its gateway. So I do this:

I got a router TP Link and I set it routing like this:

Destination IP address: 192.168.3.1

Subnet Mark: 255.255.255.0

Gateway IP: 192.168.1.1

If I set that routing in my router, I can connect to the Internet when I set my IP to the IP range: 192.168.3.x-255

If I dont set that, I can't connect to the Internet when I set my IP with a different range from the Gateway.

However, I can only connect to the Internet for about 10-15 minutes and then I can't connect to any other website?

What confused me here is why could I surf the internet for about 10-15 minutes with the different IP range and then (my computer or router) block me from connecting to the internet? Is there anything weird here? Or because I set the destination IP address wrong that make my computer was filled with a lot of connection and then it refuses to connect or something?

Is there anyone here know about that?

Thanks

Edited November 30, 2009 by nhatminh1209