WAN with bridged modem

Hi, walking around seveal problems (it's make me crazy) I found this at Wiki:

https://github.com/RMerl/asuswrt-merlin/wiki/Access-modem-Web-UI-on-WAN-port-(no-script)

Anyboby knows if this setup is with the modem in bridged mode?

I suppose that the answer is not but... I'm not sure how can I set up the gateway of my LAN and my router to the WAN.

Thanks