3 Routers Set up

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leeroyboucher

May 20, 2018
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0
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Hey,

I currently have 2 routers and added another to the guest room. Problem im facing is when I switch on the 3rd router my second router doesnt work. It shows connected but internet is not working. As soon as I switch off the 3rd router and restart the 2nd one then its working again.

Please assist
 
Solution
eibgrad
Given the OP has stated he has ethernet in each room, I'm willing to bet he's patched a switch to the modem and has each router trying to establish a public IP on its respective WAN. Or perhaps it's a modem+router that's been placed in bridge mode.

And as we all know, most ISPs only allow one public IP. So if you have multiple routers and their respective WANs connected to a switch placed before the modem, they all just end up competing for the one available public IP.

As others have stated, you should have one and only one router's WAN connected to the ISP's modem, and all other routers configured as WAPs, w/ their respective DHCP servers disabled, and patched LAN to LAN wrt the primary router.
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stdragon

stdragon

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Apr 5, 2018
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You should only be using ONE router; otherwise you will double or even triple NAT. Bad juju will occur when that happens. So don't chain-link routers.

From the router, you should up-link to a switch. From the switch, you connect all rooms from a centralized patch panel (if wired). If your router has enough LAN ports, then you can forgo having the need for a switch.

If you're trying to provide WiFi coverage to all area, consider using APs (Access Ponts) or a WiFi router that support mesh connectivity.
 
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leeroyboucher

May 20, 2018
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I have ethernet ports built in the wall in each room.

 
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Urumiko

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Dec 28, 2013
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More info and model of routers needed.

As stated above the point of a router is to provide a connection to the internet for the whole house.

Trying to run multiple full routers would be crazy. It will be possible to run the routers as access points or even extenders depending on makes and models.

You will most likely be trying to run 2 routers at the moment that have overlapping IP ranges or something. We should be able to help but would need a fuller picture of your setup including all of your router models and and ISP provided hardware.. Where is your actual connection to the internet entering the building/connected?
 
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eibgrad

eibgrad

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Feb 16, 2010
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Given the OP has stated he has ethernet in each room, I'm willing to bet he's patched a switch to the modem and has each router trying to establish a public IP on its respective WAN. Or perhaps it's a modem+router that's been placed in bridge mode.

And as we all know, most ISPs only allow one public IP. So if you have multiple routers and their respective WANs connected to a switch placed before the modem, they all just end up competing for the one available public IP.

As others have stated, you should have one and only one router's WAN connected to the ISP's modem, and all other routers configured as WAPs, w/ their respective DHCP servers disabled, and patched LAN to LAN wrt the primary router.
 
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Solution
stdragon

stdragon

Admirable
Apr 5, 2018
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6,165
You can run multiple routers behind a modem in bridge mode, but that requires a static IP block which is only to be a business class service offering.

That said, why would anyone run three routers?? Unless it is to segment and isolate the traffic on purpose, it defeats the purpose of having a LAN where devices can otherwise talk to each other.
 
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