two routers two networks one isp

I got my hands on another Linksys router and want to attempt a dual router setup creating two distinct networks. I want to be able to connect "rogue" or unknown machines to the internet, but keep my primary network isolated and protected.


So I was thinking something like this:

MODEM -- Internet port on ROUTER1 (network 192.168.6.0)
LAN ports 2-4 ----"rogues"
LAN port 1 -- Internet port on ROUTER2 (network 192.168.1.0)
LAN ports 1-4 on ROUTER2 ----- regular network


So anything that is done on the first layer "rogue" network will not affect my main network, right? Is there anything else that needs to be done to prevent traffic (or viruses, etc) from jumping the networks?

I am apprehensive because in my mind, it does not seem like it would be terribly difficult for a piece of malware to quickly ping all networks within the 192.168 range until it is successful and then make note of that address and exploit it.

Is the technology not there? Am I oversimplifying?

I tried this configuration a few minutes ago and i was not able to reach the internet on the second layer. It looks like the second layer router would not get an IP address from the first layer. Or do i need to try to get an IP on the second layer router from the modem?

Any thoughts?

 

http://www.ezlan.net/shield.html

 

Sorry for reviving an old thread, but I have the same problem as the OP and I tried everything in the link that was provided, but my second router still can't connect to the Internet through the first router.

Basically, we have an apartment in the basement to which we want to be able to supply an Internet connection and LAN network. The same Internet connection will be shared with the rest of the house, but the rest of the house will have a separate LAN.

After having done tons of Internet research I think I have this set up properly in principle.

-Modem plugs into WAN port of Router A.

-Router A's IP address is 192.168.2.1 and subnet mask is 255.255.255,0

-Router B's WAN port is connected to LAN port of Router A

-Router B's IP address is 192.168.1.1 and subnet mask is 255.255.255.0 (same as A)

-Router B is set up to receive WAN through static IP, which is set to 192.168.2.31 (outside of DHCP range of Router A).

-WAN gateway on Router B is set to IP address of Router A (192.168.2.1) and WAN DNS on Router B is set to the same as WAN DNS on Router A

-Router A's Static DHCP is set to the MAC address of the WAN and static IP (192.168.1.31) of Router B

-Router A's mode is set to 'Gateway'

-Router B's mode is set to 'Router'

Router A works fine giving me an Internet signal just like a single router setup should. I can connect to Router B, but I receive no Internet signal.

I have been able to ping both routers to and from each other.

The routers are Linksys WRT54GL running latest (1.25) Tomato firmware.

I have no idea what is going wrong here. Everything I've done so far is based on Internet research. I'm otherwise quite the novice when it comes to networking issues.

Do I have my IP addresses and DNS set up right?

Is there some DHCP/DNS setting that needs to be changed?

Do I have to do something with the firewall settings?

Any help would be greatly appreciated!