Wireguard interface, Error: Network device is not present

Installing and Using OpenWrt
#1

I have a Linksys WRT1900ACS running OpenWrt 21.02.1, r16325-88151b8303 and it has been running flawless since I upgraded until today.

My setup:
Internet -> ISP provided router -> WRT1900ACS
My WRT1900ACS is configured to connect via a wireguard interface and that has worked without problems until now.

Problem:
I did not change anything in my setup.
Today my router is not able to reach "internet".
For instance, from my WRT1900ACS ping 8.8.8.8 has a 100% packet loss but ping 192.168.0.1 (ISP provided router) works fine.
If I connect my PC directly to the ISP router and try ping 8.8.8.8 it works fine.

Question:
How should I debug this?
Any ideas of what might be wrong?

Edit,update:

Seems like I am getting Network device is not present for all my wireguard interfaces, what does that error mean?

#2

do you tunnel all traffic ? is it up, and working ?

#3

I thought that it was down due to some strange issue, but I see now that my wg interfaces are having trouble.
It says Error: Network device is not present.

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But it seems to not be visible all the time. Not sure what it means. I will be investigating. Any pointers are welcome.

#4

Couldn't figure it out.
I did a settings reset and am setting up my router again and if I the issue shows up again while I configure it I'll update this thread.

#5

Keep in mind that DSA in 21.02.x will need some configuration changes relative to 19.07.x, blindly copying configs or restoring them point blank isn't going to work.