I just updated my ASUS RT-N10P from Tomato Shibby 132 to 138 (tomato-K26-1.28.RT-N5x-MIPSR2-138-Max).
I'm using this device as a Wireless Ethernet Bridge. I've gotten it to work fine as a bridge.
However the WAN port is behaving strangely - it keeps requesting an address by DHCP even though this is being used as a bridge, so it's not really applicable - all ports and wireless should be LAN.
I can recall this was easy to do in 132 but I'm not finding any setting in 138 to assign the WAN port to the LAN switch.
This may also explain why I have no Internet connectivity through this. I can access any part of my LAN but can't get out to the Internet. Pings to internal LAN addresses are fine but anything external fails. I've assigned the appropriate gateway and external DNS but it just can't access it. So there's no router time and no Internet access through any connected device, wired or wireless.