"repeater mode" in the DD-WRT

If you want to repeat the network from an another AP，you can set the wireless->basic-setting->"Wireless Physical Interface" to "client" or "client bridge","repeater" or "repeater bridge".the difference between these can be searched. what I want to say is above all you must set setup->Basic setup-> WAN Connection Type->connection type in "DHCP" mod。 because without this the dd-wrt cannot acquire IP address from the another AP,which you want to repeated。