@KJK That's something to verify, but I don't have an environment to do that. im afraid I dont have the environment to test any of it, my ISP uses PPPoE!. I'm just working on theories... It is clear...

Do not use port NAT, delete all NAT, and try again Yes, there's no need for any port forwarding on the 7206s, only on the BT SMart Hub s @Stariaa However , I think you may be on a hiding to nothing...

@Stariaa Hi This has been changed Main Site BT Router Lan 192.168.0.1 TPLink Router: 192.168.1.1 Remote Site BT Router 192.168.4.0 TPLink Router: 192.168.3.1 Thanks for confirming. Since your Omada...

@Stariaa The routers are also connected and adopted and configured with the following subnets. Main Branch 192.168.1.0/24 Remote site 192.168.3.0/24 The BT Smart Hub routers will have a default LAN...

@KJK I think we have two problems here :- 1) Your scenario where the ISPs DHCP relay agent returns its own IP as dhcp server in the ack to dhcp req, rather than the 'real' dhcp server (presumably...

@awaykent You'll find details of the procedure on page 237 of the user guide ( download from here https://www.tp-link.com/uk/support/download/er605/v2/ ) Basically use the menu option :- System Tools...