Enabling bridge client mode (without nat)

[xection]

enable client mode:

wl ap 0

enable wireless bridge:

wl wet 1

scan for present wireless networks:

wl scan
wl scanresults

join chosen network (replace SSID with SSID of wireless network you want to connect on):

wl join 'SSID'

Finally, if you are happy with the results you can put all of this in post-boot

 mkdir -p /usr/local/sbin/
 echo "#!/bin/sh" > /usr/local/sbin/post-boot
 echo "wl ap 0" >> /usr/local/sbin/post-boot
 echo "wl wet 1" >> /usr/local/sbin/post-boot
 echo "wl join 'SSID'" >> /usr/local/sbin/post-boot
 chmod +x /usr/local/sbin/post-boot
 flashfs save
 flashfs commit
 flashfs enable

In this mode WAN port has the same purpose as in AP mode.