QRM - Quasi Repeater Mode

Using QRM we connect Fonera not through cable but via WLAN instead. It behaves like a WLAN client to another access point (AP). The ethernet port may be used in another way.

WAN is not WAN anymore?

WAN remains WAN and still will be. WAN (Wide Area Network) simply characterises uplink to the internet but not at which physical Interface it is located.
Using QRM the connection to the internet (uplink) is not established via ETH but with the help of one more WLAN - client - connection (ath2) that has to configured to authenticate with existing wireless network. So WAN is ath2.
The following example shows the WAN of a Fonera connected to a Fritz!Box which shall route all packages from our Fonera to the internet.

[QRM - normal without ethernet]
             (192.168.3.0/24)                            (192.168.10.0/24)
                                                           private signal
                   /                                 (LAN)
         (..3.1)|  WLAN              (..3.2)
DSL - FritzBox -- |  SSID:   . . : : . . (WAN) FONERA (ETH) (deactivated)
                  |MyCastle
                   \                                 (WIFI)
                                                           public signal
                                                           (192.168.182.0/24)

Is that usefull?!

The QRM is suitable with many scenarios. If there is no way to put a network cable for instance or the signal of the Fritz!Box from your workroom is too low to reach the laptop in the livingroom, you simply plug the QRM-Fonera in the corridor to have a private signal covering the livingroom.
or... or... or...

Configuration

To match the example above you enter "MyCastle?" at "Remote SSID", choose the authentication method given by your Fritz!Box and the password also. Your Fritz!Box is configured to serve IP addresses by DHCP server probably. The Fonera should use a manually given IP address out off the range of the Fritz!Box DHCP server nevertheless to avoid problems with the connection to the Fritz!Box later on.
In this case we type in the WAN IP address for the Fonera in the "IP Address" field (192.168.3.2), same as subnet mask (255.255.255.0), gateway - the Fritz!Box IP - (192.168.3.1) and the DNS server. You may use any other DNS server instead.
The ethernet port is deactivated in this example, fallback IP keeps active although.