@Clive_A Tested and it works! That is great news. Do you think this is considered as a work around and a fix will come in a future release? The WAN interface is a DHCP client, so IP-adresses (and...

@Clive_A What would be the goal of making this static route? Still I don't know how to mirror the USB LTE interface. Kind regards.

@Clive_A Creating a Wireshark of the WAN interface is no problem. I will do so when I'm back on site tomorrow. Could you please instruct me how to mirror the USB LTE modem within the router? I'm not...

@Clive_A Thank you for the response. Test 4 is a good option which I executed right away with the result a bit lower in this reaction. Port mirroring could give an even more detailed sight, but I...

@Clive_A Many thanks for your reply and patience. I've repeated the tests and included the results: Used IP addresses: - 95.99.xx.yy --> WAN IP address of TP-link router (local site) - 91.87.xx.yy...

@Clive_A Many thanks for your reply. I replaced the whatmyip test with a traceroute test, but I observe the same behavior: 1. Router restarts -> Wireguard connection via primary WAN -> Traceroute via...