Currently I am facing an issue, where the OpenWRT router is not shifting to LTE when the WAN cable is connected and does not have internet connection when Wireguard tunnel is active.
I am looking for help from the community where:
I want to know how the router can automatically shift from WAN to LTE, when internet on the WAN is not active and establish the tunnel with LTE and take all the traffic.
When the internet is back on the WAN, the tunnel should be shifted back to WAN cable and take all the traffic, shifting LTE on 2nd priority.
I am looking for a preemption method, where we will be utilizing WAN cable as much as possible and not utilizing the data of LTE in case the wan is available.
mwan3 does not interrupt existing connections, so I believe you need to ifup your WireGuard interface if wan goes up (so it doesn't continue to use the LTE wan interface it failed-over to before). That's quite easy to do, either within the /etc/mwan3.user shell script, or as a standalone shell script in /etc/hotplug.d/iface. It goes something like this:
[ "$ACTION" = ifup -a "$INTERFACE" = wan ] && ifup wg0
(untested, standalone script needs the shebang on top of the script of course)
Edit, for posterity: This only works if the wan interface actually notices it's down (e.g., pppoe), otherwise as suggested below one would have to check for the "connect" action, but that only works in mwan3.user, not as standalone hotplug script.
Hi @takimata
Thanks a lot for your reply
I have tried out something similar to the script which you mentioned
#place this script in /etc/hotplug.d/iface
#!/bin/sh
[ "$ACTION" = "ifup" -a "$INTERFACE" = "wan" ] && {
logger "iface wan up detected..."
ifup modem_1_1_2
}
exit 0
But this script is only working when I unplug and plug the WAN cable back into to the router.
When the WAN cable is already plugged to the router and the internet is down in the cable the router is not able to detect that the internet is down and not shifting the wg tunnel to the LTE interface and when the internet is back on the WAN cable the router is not able to shift the wg tunnel from LTE back to WAN.
Each time I got to restart the router to make the wg tunnel to shift. I want to the shifting to happen automatically without any restart
Thanks a lot for reaching out to help
I tried to use the script which you mentioned above and the made few changes as you suggested. After using it the wg interface keep restarting every 20 secs. I think the mwan3track is tracking the WAN cable as disconnected even when it is connected. Any way to solve this?
Restarting the wireguard interface seems to provoke some events on the wan interface that I can't explain.
Insert logger -t hotplug.mwan3 $(env) into /etc/mwan3.user just above /bin/sleep 10; ifup ... and check the logs using logread -f -e hotplug.mwan3.
Then comment out everything in /etc/mwan3.user except the last (logging) command added and check the logs again to see if there will be any mwan3 activity on the wan interface.
