Plug in to port 2-4 (not port 1 as that will be the customer port).
Provision an IP out of 192.168.1.0/24 on your computer and go to 192.168.1.1 in your web browser.
Bridged WAN Interface
Routing WAN Interface
Disable Firewall Under Security Settings
Go to Network Settings -> Interface Group.
Add New Interface Group.
Name it LAN.
Then add `Bridge/ptm0.2` and also `LAN1` to "Grouped LAN Interfaces".
Go into Maintenance -> Remote MGMT and check all boxes under WAN
You should still be able to get to 192.168.1.1 from LAN ports 2-4. The 172.16.253.x address should be accessible from the VDSL WAN.