@SingletrackMind The only secure way is to use 802.1X authentication. Other alternatives that will deter prying eyes is adding the devices to the managment vlan and adding firewall rules to block...

If allowed in your country's building regulations (many places have explicit COPPER-only requirements) and the cables are installed by a professional then it should work just fine. However unless the...

@spd2612 That's a terrible "business" gateway.. try to get something business grade..if you insist of using ethernet SFP modules , get a TL-SM331T instead. I do not recommend that unless ethernet is...

@Jeesoon1 is the connection failing PPPoE ? does it uses the internet vlan advanced option?

Thanks I got the message, will try to provide more feedback soon.

@DREEMus I have a backup this time for the old controller version that doesn't exhibit this problem..I also have another SFP device which I configured to untag the internet vlan without he router...