two routers, one failover, how to configure home network?

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karknoey

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Mar 2, 2017
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Hi,

I have a question on how to configure my home network.

I have a cable modem and DSL modem.

Currently, I have a primary router that I use for my home network and my cable modem is plugged in to my primary router WAN port. The DSL modem is sitting idle as a backup. If I lose cable connectivity, I would connect the DSL to the WAN port and be on my way. It is a crude manual failover but mostly it works.

What I want to do now is set up a second router as a failover router for my office computers. The new failover router has 2 WAN ports in the back and 3 LAN ports. I want my 3 office computers to connect to the failover router. I can then plug in the DSL modem into WAN port 2 as the backup.

My question is, can I just plug the WAN port 1 of the failover router into a LAN port on my primary router to get access to the cable modem connection through my primary router? Do I need to disable DHCP on the failover router so that it doesn't cause trouble with the DHCP running on the primary router? Also, I don't want the office computers to be able to see the home network that are on the primary router. I want to be able to remote access the failover router and the office computers but I don't want that remote access to inadvertently allow access to the other computers on the home network. Do I need to change the configuration or change the subnet mask settings? Do I need to reverse the cabling order of my primary and failover routers?

For the sake of discussion, currently the primary router is 192.168.0.1 and the failover router is 192.168.1.1.

Thanks!
 
Solution
A
1. The config you propose would work for the purpose of having your office PCs access the Internet. No need to disable DHCP on the office router. However, your home PCs will be the Internet for them, so your office PCs can see (it's another question whether they can access) the PCs on the home network.

2. DSL router' WAN port will be visible to your home PCs. In order to remote manage it, it must support management session thru WAN port. If you want to remote access your office PCs from home network, you should proceed in same way as if you do that from around the globe - office PCs are behind a router.
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Alabalcho

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Jan 13, 2011
14,019
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1. The config you propose would work for the purpose of having your office PCs access the Internet. No need to disable DHCP on the office router. However, your home PCs will be the Internet for them, so your office PCs can see (it's another question whether they can access) the PCs on the home network.

2. DSL router' WAN port will be visible to your home PCs. In order to remote manage it, it must support management session thru WAN port. If you want to remote access your office PCs from home network, you should proceed in same way as if you do that from around the globe - office PCs are behind a router.
 
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