2 Routers, 1 Switch

[intzaki]

So basically I have a simple ethernet/internet cable that comes from outside and is plugged in to the switch. This switch has 4 more ports with 4 ethernet cables running around the house. I have 1 router that is working as expected a high end Cisco router. Now I connected my old one low end Asus router that worked perfectly before, to another ethernet port. So now I basically have the switch with 3 ethernet ports (one the internet from outside , the other Cisco, and the other Asus). Problem is that the Cisco works but my Asus doesn't. I connected my Asus later on aprox 1 month after the Cisco router. But it doesnt work. I try to reset its internet status, disconnect and connect back again but it still comes up with problems. Now its not only the wireless function that doesn't work but the ethernet cables connected to the router also dont get any internet. Im no expert on this field but I do know how to get around this stuff. Please help

 

[RealBeast]

Where is your cable modem in the arrangement, and does the "cable from outside" have the capability to provide more than one IP address from the ISP?

Consumer connections can only handle one router unless you cascade them to create an isolated subnet.

What exactly are you trying to accomplish?

 

[eibgrad]

Sounds like the OP is using structured wiring, where the home has internet service coming into the junction box. Let's assume there's a modem in the picture somewhere (perhaps the CISCO router is also a modem, probably doesn’t matter).

If you connect a second router behind the CISCO (and I’m assuming you mean via its WAN port, NOT a LAN port), it should work. But there’s a catch; the CISCO and ASUS can NOT use the same network! So if they’re both using say 192.168.1.x (which is highly probable), that’s a problem. Make the ASUS 192.168.2.x instead.

But there’s an even better solution. Turn the ASUS into a simple wireless AP (don’t use it as a router). Disable its DHCP server, give it a LAN IP in the same network as the CISCO (e.g., if the CISCO is 192.168.1.1, perhaps make the ASUS 192.168.1.2, just make sure it doesn’t conflict w/ IPs being handed out by the CISCO DHCP server), and patch it to the CISCO router, LAN to LAN (no WAN).