Oh so you want to use the 615 as a repeater? 
I just want to use my netgear to catch WIFI signal from DIR615
Netgear to be witch different ESSID (name) and when connect from laptop to netgear ESSID, he give me a strong signal and WOALA.
But default firmware on DIR 615 can't send WIFI signal to another router...so i have to install DD-WRT and configure again.
If I do that:
Is other users can connect to DIR615 normally and use internet as ususally ?
If you know other method tell me, because in default firmware in DIR615 i have this options:
NetBIOS announcement : uncheck
Learn NetBIOS from WAN : uncheck
NetBIOS Scope : D_Link (optional)
NetBIOS node type :
Broadcast only (use when no WINS servers configured) - this is check
Point-to-Point (no broadcast)
Mixed-mode (Broadcast then Point-to-Point)
Hybrid (Point-to-Point then Broadcast)
Primary WINS IP Address : 0.0.0.0
Secondary WINS IP Address : 0.0.0.0
TFTP server :