Using my LinkSys WRT54G as a router in a home network, but not as the Gateway of the same?

Greetings,
I am in a situation where I share internet access with roommates. We have a Gateway which is conected to the provider and which delivers ethernet and WiFi signal.
In order to isolate myself from my roomates and to protect my network connection, both wired and WiFi, I would like to plug in the Ethernet cable I get from the Gateway to my router, and then configure my router's firewall and WiFi enctryption to maximize my safety.
However, I am having some problems. I have already configured the router as "router" and not "Gateway" and I am trying to assign it an IP address different from the default one, which is the one the gateway has, and a ranger of DHCP IP's, also different from those of the Gateway. In other words, 192.1681.N.1 for the router and start from there.
Any pointers will be appreciated because so far, my efforts have failed.
Jean-PIerre

There are two (2) ways to cascade a Linksys router to another router:
1. LAN to LAN – Connecting one of the Ethernet ports (LAN ports) of the Linksys router (router A) to one of the Ethernet ports (LAN ports) of another router (router B).
This type of cascading requires the main and the secondary router to be on the same LAN IP segment to allow the computers and other devices to connect to both routers. This configuration is recommended if you want to share files and resources within the network.
2. LAN to WAN – Connecting one of the Ethernet ports (LAN ports) of router A to the Internet port (WAN port) of router B.
This type of cascading requires the main router and the secondary router to have different IP addresses. This connection makes it easier to identify which router the computers and other devices in the network are connected to since they will have different LAN IP segments. However, computers that are connected to router A will not be able to communicate with router B, and vice versa since they are two different networks.
Here is the link for same: http://www6.nohold.net/Cisco2/ukp.aspx?vw=1&docid=d4bfc9fde5284a4b845c9057ffbeb644_4735.xml&pid=80&r...

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