how to add lan1 to WAN VLAN?

[Webside]

Dear,

I want to add LAN port 1 to the WAN VLAN.
How to do that please?

I connected my cable modem to the WAN port, and i want to connect my digital television set-up box to the LAN port 1.
The set-up box receives a special ip range (10.x.x.x) from the cable modem (provider) other than the IP range (84.x.x.x) used for internet traffic (also received from the same cable modem) given to the WAN port.

P.s.: currently i have a Linksys (Tomato Shiby firmware) router; in that custom firmware it is very easy to change the VLAN membership of all the ports... . I want to migrate to an ASUS router (and install Merlin firware).


Thanks,
Kind regards
Webside