@ArthurSpooner a lan dns should fix it, create a dns pointer that is similar to the one you have on the internet but let it point to local ip. you find this setting in network config, then go to LAN...

@Vincent-TP and thank you for adding vlan configuration to the port profile again.

@icysummer When I test, I only get expected ports that are open, have tested against ER8411, ER707-M2 and ER706W.

what parameter do you use in nmap, I can try to test on my network.

@icysummer how do you test? if you test from LAN then many ports will be up due to loopback if you are going to test from LAN you can try GRC test When I test my router I get this result

@Vincent-TP Upgrade on Linux, Windows and Raspberry pi4 with PI OS. no problem so far, :-)