I have an RT-N66U running the latest Merlin firmware connecting it to a Comcast Gateway. I successfully connected the 5Ghz band of the RT-N66U to the 5Ghz band on the Comcast Gateway in repeater mode. I can connect successfully to either of my repeated SSID's either on the 2.4Ghz or the 5Ghz band and get a valid IP address. The issue I am having is that the gateway IP the is received via DHCP either on the 2.4Ghz or 5Ghz is the IP for the RT-N66U repeater and not the IP for the comcast...
RT-N66U Merlin F/W Repeater Wrong Gateway IP
RT-N66U Merlin F/W Repeater Wrong Gateway IP