I already have the Flint 1 router (v3.x) at home acting as a Wireguard server, with several Glinet travel routers acting as clients (Beryl, Beryl AX, and Mango), and everything is running smoothly.
My Flint 1 is connected via wired connection to the ISP router and configured in bridge mode, with port 51820 forwarded and DDNS enabled.
Now, I would like to upgrade Flint 1 from 3.x to v4.x, but I wouldn't like to delete and reconfigure everything, at least not without having an additional server backup.
For that, I am considering purchasing or using an additional router (such as Beryl AX/Slate AX or even upgrading to a new Flint 2) and configuring a second Wireguard server.
If you see this feasible, how should I connect this second router?
How the IPs/ddns will be managed between both Wireguard servers?
We have take many updates from FW 3.x to 4.x, thus you cannot keep the settings when you upgrade it.
You will have to setup all the settings, including the wireguard server totally again after the upgrade.
As for the second router, take Flint 2 as the example, the topology shall be:
ISP modem --- (WAN) Flint 1 (LAN) --- (WAN) Flint 2 (LAN) --- other client devices
Firstly, this settings would not affect your existing wireguard server on Flint 1.
For the detail:
The subnet of Flint 2 shall be different, for example you can set it as 192.168.18.1
You need to use the different external port on your ISP modem and Flint 1, for example 51830
Add another rule on your ISP modem from external and internal port 51830 to Flint 1
Add another rule on your Flint1 from external port 51830 and itnernal port 51830 to Flint 2
On Flint 2, setup the wireguard server port to 51830 and start it
If your ISP modem has 2 LAN ports, you can connect the Flint2 directly to it as well.
And the settings just similar but no need to set the port forwarding fule on the Flint1.
This will definitely help!
Thanks a lot for the detailed explanation. I will follow these steps to configure the second router and let you know if I encounter any issues.
Cheers!