Use wifi adsl router as AP connected to another wifi router

Hi. I have cable connection in which the cable modem is connected to a wired 4 ports router (dlink di-604). In an ethernet port in that wired router i have a wireless adsl modem/router (dlink dva-g3170i) with dhcp deactivated and the LAN ip between the same range of my wired router. until here everything is fine, i have wireless internet and local network through the wireless adsl modem/router. now the problem... i have a second dva-g3170i that i would like to use as an AP to have longer signal..
can someone indicate or explain how to do that?

Thanks.

 

Router with Wireless access is different (reduced) feature set compared to a dedicated AP with Bridge, or Repeater functions. Sometimes routers can be hacked for extra features. Otherwise you need a dedicated AP.

See DD-WRT or http://www.openwrt.org/ for possible solution.