How To Setup Cellular Failover On Your Home Network (Using TP-Link Gear)
Channel: Daniel Rosehill
Date: 2021-09-13

Today, I finally finished setting up my home network in a way that is optimized for automatic failover onto 4G cellular connectivity. After some experimentation, I finally worked out how to get my TP-Link cellular router (TL-MR 100) to feed its connectivity into my TP-Link load balancer (R470T+). (Make sure to assign an IP to the cellular router that's outside the IP address range of the LAN devices that the main router is neworking / in a different subnet). 

The ISP line goes into the load balancer too. And then there's a WiFi access point downstream. Everything is working great and the failover time from ISP to cellular is now less than 2 seconds - compared to 20-30 seconds when doing failover just on the cellular router (with ISP pass-through connectivity).

Two corrections:

The upstream router needs to have an assigned IP that is a different subnet to the LAN / DHCP server. Therefore it needs to be OUTSIDE the range on the LAN.

Secondly the failover time isn't quite as rosey as I thought. On repeated testing I'm getting more like 30/30.

To open source the 'how to' for this project, here's the 'documentation' describing exactly how I set this all up:

https://danielrosehill.medium.com/how-to-set-up-a-budget-home-internet-network-with-backup-cellular-connectivity-ad5ab3740da5?source=your_stories_page-------------------------------------

By: Daniel Rosehill (danielrosehill.com):

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