Client Mode + AP mode
A router in Client Mode connects to another wireless Access Point (the host router). It uses its wireless connection as the WAN interface, and shares the internet connection only to the LAN ports.
In a managed wireless network the Access Point acts as the Master device. It holds the network together by managing and maintaining lists of associated STAs. It also manages security policies. The network is named after the MAC-Address (BSSID) of the AP. The human readable name for the network, the SSID, is also set by the AP.
Remember that you WILL lose 1/2 the bandwidth using the Client + AP mode because it's sending/receiving both ways plus it has to split that bandwidth over 2 separate SSID's.
To select “client+AP” you must first change Internet/WAN to connect via:DHCP wireless
Configure screens shown below
WAN Ethernet Port: set to “Bridge to LAN”
If I left WAN Ethernet Port disabled, Client+AP would not work for me.
I was able to have different password keys for the Client and the Access point set-ups, and also used different IP ranges.
Internet is working no problem - this post is actually being done from the Client + AP config - I am connected Wirelessly to the Gargoyle router - main router = Asus RT-N16