All, I am getting a very similar error. I am also a Tailscale user. I was able to use my GL Beryl MT3000 flawlessly for months as a subnet router pointed to an exit node for months with no issue at all. I have done all of the standard Tailscale setup, etc. As I said it was working for months.
I recently moved and it stopped working. I had made no other changes to the router at all before it stopped working. Then I ran into an issue where using the Tailscale exit node bricked my internet. As soon as I turned this off it worked again. Though I never had to so this initially, I setup a firewall zone and interface like is mentioned here: Help to configure tailscale as a proxy service - Installing and Using OpenWrt - OpenWrt Forum
This fixed the issue of the Tailscale exit node completely killing my internet, but it makes no change to the external IP when I check whatismyip. I disabled mwan3, but that did nothing.
Now I am currently getting the “The interface is connected, but the Internet can’t be accessed.” error similar to what a lot of others here are getting, and similar to them my internet works fine without issue despite this error. It displays whether Tailscale is on or off. I ran the commands that were supplied above in this thread and this did not fix the issue. I’ve tried several different firmware versions,but am currently on 4.2.3 because that seemed like it was the most stable.
The only thing that I changed that caused this not to work was moving and connecting to a new modem. As you mentioned above, is that possibly what the issue is? You mentioned changing the WAN IP, but I can’t do this as it is not my Modem. Do I need to change the subnet route of the GLiNet and/or change the LAN IP from the default 192.168.8.1?
Any help would be greatly appreciated.
Update:
I manually installed version 4.4.5 and this fixed the no internet connection error message, but doesn’t fix any of my Tailscale issues.
Which internet menu you are you wanting me to show? I tried the manual 8.8.8.8 DNS as you said and this didn’t have any effect on it changing the IP address as I need it to, it still shows my real IP. Also, here is a screenshot from the Tailscale page. It does a thing where it will show as connected then it’ll say connecting again then it’ll reconnect. Not sure what the issue is there that would be causing that either.
It seems that you cannot start up the Tailscale service, have you work this router as the exit node as per the post you provided?
If so, maybe you can give this router a factory reset. Since you shall use other site as the exit node but not this router to show other Internet IP address on this router.
I have factory reset this router more than three times and it has not solved the issue or made any difference at all. Also, I can start Tailscale, but the issue is that it won’t change my IP to the IP of the exit node which is what I want. Tailscale will connect and show as active in my machines, but it will give me that connecting every 30 seconds or so like in that picture, like it is constantly disconnecting and reconnecting. I also have no use for using this device itself as an exit node.
Is there anything else that I can try to get this to work?
Update for this case, so that other guys can find a fix if the same issue.
Thanks to the kindly help of @chen1, we have found that this issue may be related to the wan/lan route rules of tailscable, and we now have fixed it in this beta firmware v4.4.6. You can download it in this link: https://dl.gl-inet.com/?model=mt3000&type=beta
sed -i 's/route_param="$target dev $dev"/route_param="$target table main"/g' /usr/bin/gl_tailscale
sed -i 's/\/sbin\/ip route add table local $route_param/\/sbin\/ip rule add to $route_param/g' /usr/bin/gl_tailscale
sed -i 's/\/sbin\/ip route del table local $line/\/sbin\/ip rule del to $line/g' /usr/bin/gl_tailscale
Seconded, I was banging my head against the wall trying to solve this issue. For the record I am running a Tailscale exit node on an Unraid server. And I could either have internet without the tailscale connections working, or the connections working but no internet. Finally. It works! Thank you!
