Inside the manager page - http://192.168.1.1/index.html#settings/router/basic it says
"When set to Bridge, this option turns off the router function of the device and assigns the network IP address directly to the attached host. This option can be useful for implementing secure, enterprise VPNs."
Funny though because there is nowhere on all the device pages where it says how to turn on bridge mode.
There are options for IP Passthrough mode:
IP Passthrough Mode
Automatic (while docked on Smart Cradle)
I presume IP Passthrough mode is Bridge mode although I have just rebooted my modem & with passthrough enabled i'm getting 192.168.1.x passing through as my WAN IP not the public IP.
This used to work. Not sure what's changed.
not sure if this post is still relevent with your firmware or router