One Shop, Two ISPs. Will This Work?

First time poster here. I thank you for your assistance in advance.

My retail shop uses Comcast Cable (calling it CC going forward) as the ISP. I just added Verizon 5G Business internet (calling it VZ going forward) as the backup for the times when CC is down (which has been more often than I like).

The LAN IP for the CC router is 10.1.10.1

The LAN IP for the VZ router is 192.168.0.1

The problem is that every time when a device connects to the VZ network, it will get assigned, by the VZ router, the default gateway of 192.168.0.1 and an IP in the 192.168.0.x range, which is fine, but when I'd connect back to the CC network, somehow the 192.168.0.1 default gateway and the 192.168.0.x IP get stuck in the device. Now, this device cannot be seen in the CC network nor can it go to the internet. I have to manually renew the IP on the device so that it will go back to 10.1.10.1 default gateway and a 10.1.10.x IP.

I am thinking:

I will change the VZ router’s LAN IP to be the same as the CC router's 10.1.10.1

I will then set the VZ router’s DHCP range to be the same range as that in the CC router.

We would NOT connect to the VZ network unless CC is down. This should avoid the conflict of having two routers with the same LAN IP.

Will this solve the problem?

Sorry about the typo in the title. I meant to write "One Shop", not "One Hop". LOL.

Mod Edit:  Fixed - Hamluis.

Edited by hamluis, 31 March 2024 - 12:24 PM.

I was wondering if it exists for consumers (because it definitely exists for businesses), and it does.  Search for a "Multi-WAN Router" which feature load balancing as well.  You will be able to set CC on WAN1 and VZ on WAN2.  All your devices will be on your LAN, and the router will decide which network is easier/faster/cheaper to reach the Internet, all automatic and transparent to your users.

Edited by Dominique1, 03 April 2024 - 06:48 PM.

You are so negative, Dan.  I found a really nice one at Amazon, $59, the possibility to have 3 hardwired WAN + another one from USB.  I won't name a brand because I haven't tested them.

Edited by cryptodan, 03 April 2024 - 08:14 PM.

After some researching, I too have learned about multi-WAN routers. And I think I will try that. 

Asus makes a number of dual-WAN wifi router for about $100 and up. Many of their high end gamer routers cost several hundreds and feature dual-WAN.

But the one I am thinking to buy is an older model by Synology (RT2600ac) for $150.

At first I want to buy one of  Asus' dual-WAN routers because I have already had good lucks with Asus products. But there is one thing I don't like about Asus' dual-WAN routers. They can only do either Load Balancing or Failover/Fallback, but not both. I want to do both and the Synology router gives you that option. This brings me to the question below:

I read some people suggest that, if you configure the dual-WAN router to do Load Balancing, you don't need Failover/Fallback also. The reasoning behind this is that, by virtual of the Load Balancing mechanism, it will also give you essentially the Failover/Failback functionality. The logic is that, since Load Balancing uses both ISP connections, it would make sense that when ISP A connection is down, all the traffic will simply go through ISP B connection, and, when A is recovered, both will be used again. This sounds logical, but is it true in reality? I hear other people saying that, unlike the Failover/Fallback configuration, with Load Balancing, it may take a long time before the router would act to direct all traffic to the healthy connection, plus, it may or may not fallback to using both connections again even after the down ISP recovers. Does anyone have any real world experience in this?

Edited by RA2024, 04 April 2024 - 11:08 PM.

Several of the more common third-party open source firmware projects support Dual WAN. This includes FreshTomato, OpenWRT and DD-WRT.

You may want to look into those, but if you have really high bandwidth needs, you might need to run the firmware on X86/X64 hardware instead of just off-the-shelf consumer gear such as Asus or Netgear.