Setting Router (DD-WRT) as a client in unbridged mode

This a a Linksys router (DD-WRT), I just borrowed to configure it as a client hahaha. I mean config this router to connect main router ( has WAN) via wireless network, then make computers and client router connect together via LAN.

To set it up do as follows:

• Change router mode (in wireless tab) to client mode, and set SSID to be the same as main router's SSID.
• In wireless security tab (sub tab), set security mode and password to be the same as main router's also.
• In security tab, disable firewall because it will make your setting become harder to be set. You can configure later if you want to.
• In setup tab, change connection type to Automatic Configuration - DHCP, and disable STP.
• Change router IP, which is different from main router IP. e.g. if your main router IP is 192.168.1.*, you can change a client router IP to 192.168.2.*. Next, use the same subnet mask.
• Check at Use DNSMasq for DHCP.
• Check at use DNSMasq for DNS.
• Check at DHCP-Authoritative.
• Set other stuffs if necessary.

Reference: http://airfart.blogspot.com/2008/04/how-to-set-client-mode-on-dd-wrt.html