Dual WAN failover/failback

MatsR

New Around Here
I have a network setup with an Asus router (GT-AX11000) connected to four wired Asus AiMesh nodes (RT-AX92U). Yes, I need that amount of nodes for good coverage. The router is connected to my fiber (1000/1000 Mbps) provider for internet access.
In order to get a more secure connection to the internet in case the fiber connection goes down I would like to setup a dual WAN failover/failback with the fiber as primary WAN and a 4G connection (USB dongle) as secondary WAN. After reading about Asus and failover/failback it seems that their solution for this is not reliable, is that true? Most posts I have read instead suggest using a Synology router for this, like for instance the RT2600ac. However I don’t want to replace my Asus devices with something else. So my question is can I put a new router (like the RT2600ac), connect it to WAN (fiber and 4G) to get dual WAN, and then connect this new router to my existing router and still keep all the features I have with my existing ASUS network setup? So I only want to use my new router for Dual WAN and not for Wifi or anything else.
Is there any configuration that I have to change on my existing Asus router or the nodes?
Is there any special configuration that I have to do on my new router?
Do I connect the router via the LAN port on the new router to the WAN port on the existing router?
Any suggestions on what new router to select (Synology RT2600ac or other) in order to get as good performance as possible?
 

geobernd

Regular Contributor
Switch the Firmware to the latest AsusWRT-Merlin and use the script developed by @Ranger802004 :

I am using it with 1000/1000 fiber primary and 60/18 cable backup - works like a charm!
 

Ranger802004

Very Senior Member
Switch the Firmware to the latest AsusWRT-Merlin and use the script developed by @Ranger802004 :

I am using it with 1000/1000 fiber primary and 60/18 cable backup - works like a charm!
Thanks for the reference! @MatsR I actually have the same router as you and it is what I use to develop and test the script.
 

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