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It’s working however it does not seem stable over time: for unexplained reasons (happened again last evening) VPN traffic will no more go through without clear reasons and device will become unstable / unresponsive. It does not happen with Brume with the very same config in terms of vpn config, policies.
Only way to solve it is to reboot (unplug) the router as GUI or Luci access is no more possible either. My internet line (500 Mbps fibre) & ISP is of good quality and not causing the VPN to stall.

I have even put a script in etc/config directory call from the crontab (lucid “scheduled tasks”) to test the VPN traffic availability and if I cannot ping google through the vpn interface (“wgclient” on slate ax), I will retry again and then trigger a reboot.

script:

if [ “$(ping -I wgclient -q -c 3 -W 1 8.8.8.8 | grep ‘100% packet loss’ )” != “” ]; then
logger -t WIREGUARD_Reconnect WIREGUARD Tunnel has got NO internet connection, RETRYING IN 60S
sleep 60
if [ “$(ping -I wgclient -q -c 3 -W 1 8.8.8.8 | grep ‘100% packet loss’ )” != “” ]; then
logger -t WIREGUARD_Reconnect WIREGUARD Tunnel has got NO internet connection, REBOOTING IN 20S
sleep 20
reboot
else
logger -t WIREGUARD_KeepAlive WIREGUARD Tunnel is alive, Google ping OK
fi
else
logger -t WIREGUARD_KeepAlive WIREGUARD Tunnel is alive, Google ping OK
fi