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3 routers 1 modem set up

Last response: in Networking
February 18, 2010 5:09:39 AM

i have 3 routers.

i want to use router1 as gateway.

then router2 & router3 as workgroup routers.

is this possible, and with internet service available to all?

More about : routers modem set

Best solution

February 19, 2010 1:26:51 AM

If you want to use additional routers AS DIFFERENT SUBNETS, then yes, you can do that. You just connect the WAN port of routers #2 and #3 to LAN ports on router #1. The WAN port defines the boundary between different subnets. Routers #2 and #3 will receive their WAN IP from router #1. And any clients using routers #2 and #3 will have their internet traffic routed to their respective routers and forwarded to router #1 and out to the Internet. It's just works.

Just make sure each router uses different IP scopes. IOW, if we assume router #1 is using 192.168.1.x, then perhaps router #2 uses 192.168.2.x and router #3 uses 192.168.3.x.

That’s about it. The only downside is when you have unsolicited traffic from the Internet (e.g., someone trying to remotely access some machine behind router #2 or #3). Having to deal w/ firewalls and port forwarding across MULTIPLE routers could be a PITA. But you can do it.

Btw, realize based on the configuration I’ve outlined, clients of router #2 can’t see/access clients of router #3, and vice versa. Their respective firewalls prevent it. However, clients of router #2 and router #3 can see/access clients of router #1.

You could also chain the routers, in order (router #1->router #2->router #3, always using the WAN port). Clients of router #1 can’t see/access clients of router #2 or router #3. However, clients of router #2 can see/access clients of router #1. And clients of router #3 can see/access clients of router #1 and #2.

So it just depends on what you’re trying to achieve that determines the proper configuration.

February 19, 2010 1:30:12 AM

Absolutely. Connect router 1 to the Internet. Connect routers 2 and 3 to router 1. Use static IP addresses for the Internet port on routers 2 and 3 and a different network for all 3 routers.


Router 1
Internet IP address provided by your ISP
LAN IP address

Router 2
Internet IP address (connected to router 1)
LAN IP network

Router 3
Internet IP address (connected to router 1)
LAN IP network
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March 1, 2010 12:13:07 PM

Best answer selected by markfom.
August 30, 2011 9:53:46 PM


i'm trying to setup 2 routers on 1 modem, but i'm trying to achieve a different goal here - is it possible to have router #1 running one IP (let's say local/main provider), and router #2, being connected to #1, still run a different IP, configured via VPN.

Issue i'm having is that I want to be able to access Netflix while out of the country on the #2 router and still have strong signal for other activities on the main router :) 

Any ideas ?