@senatorchris Hi, dude, I think ER605 is better than Archer C9. This router is advertised as Business grade and is undoubtedly more powerful.

@kallistos Hello, I think your issue is related to the DFS channel, take a look: DFS function

@Avocado_Mafia Hi, it sounds weird, VLAN and wifi encryption don't have a necessary association, as I know. Maybe your phone has remembered the password before, then it will connect to wifi...

@BadgerBadger Hi, I think so. A real Managed Switch to test/monitor is a better choice.

@Peter_V Does it seem like the same needs as this? https://community.tp-link.com/en/business/forum/topic/603766 PPTP is a client to lan VPN either.

@user245 If I understand correctly, ER605 IPsec to Android or ios means the VPN you set is Client-to-LAN VPN. Client-to-LAN VPN you can understand that the phone can access the LAN behind the...