Dir-615 how to use LAN port as WAN port [closed]

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http://serverfault.com – I have a dlink router dir-615. Internet is connected via ppoe, with IPTV and STB. On the router is dd-wrt. I can not in any way to configure IPTV for this to work on the console. No need to set it up for players to computers connected via lan or wi-fi. I read what you can do a lan port as wan to assign ip to the STB from the ISP. In Dir-320 is done through the command switch, but it not available and I could not find the special codes. I tried to configure through the nvram (vlan0ports etc.), but achieved nothing :( Sorry for my english (google translate used :) ) (HowTos)