Link between SB6120 and RT-N66U defaults to 100BASE-T

[ConnYack]

I recently purchased an ASUS RT-N66U. I have it connected to a Moto SB6120. Out of the box the Router had 3.0.0.4.220 firmware. I pushed .246 to it and now I have a problem. The link between the modem and the router is stuck at 100BASE-T. I gather this from the fact that the modem link light is blinking orange. Orange = 100BASE-T, Blue = 1000BASE-T. I talked to ASUS support for 45 minutes and no cookie. My internet speeds are phenomenal; I only pay for 35Mbps down. I get full speeds out to about 150 feet. I just want the modem - router link to be gigabit because it's supposed to be. Anybody have a clue what is going on? Feel free to school me if my understanding is off.

 

[Raptor]

I recently purchased an ASUS RT-N66U. I have it connected to a Moto SB6120. Out of the box the Router had 3.0.0.4.220 firmware. I pushed .246 to it and now I have a problem. The link between the modem and the router is stuck at 100BASE-T. I gather this from the fact that the modem link light is blinking orange. Orange = 100BASE-T, Blue = 1000BASE-T. I talked to ASUS support for 45 minutes and no cookie. My internet speeds are phenomenal; I only pay for 35Mbps down. I get full speeds out to about 150 feet. I just want the modem - router link to be gigabit because it's supposed to be. Anybody have a clue what is going on? Feel free to school me if my understanding is off.

I also have the SB6120 and RT-N66U. The SB6120 link light is Blue. My first guess would be to check the Ethernet cable. I use Cat-6, Cat-5e will work too. Anything Cat-5 and below will drop back to 100BASE-T. Some times the quality of the cable assembly is poor and will cause a drop to a lower speed.

 

[ConnYack]

I also have the SB6120 and RT-N66U. The SB6120 link light is Blue. My first guess would be to check the Ethernet cable. I use Cat-6, Cat-5e will work too. Anything Cat-5 and below will drop back to 100BASE-T. Some times the quality of the cable assembly is poor and will cause a drop to a lower speed.

I have a 4ft piece of Cat 6A connecting the two. I get the same Orange light with other cables.

 

[SoCalReviews]

Try power cycling first the modem and then router If that doesn't work then try rolling back to official Asus firmware version 3.0.0.4.220. Visually check the pins on the wired router WAN port and modem's port to make sure that none of them are bent. All eight wires are required to have connectivity for a gigabit connection to work.

 

[ConnYack]

Try power cycling first the modem and then router If that doesn't work then try rolling back to official Asus firmware version 3.0.0.4.220. Visually check the pins on the wired router WAN port and modem's port to make sure that none of them are bent. All eight wires are required to have connectivity for a gigabit connection to work.

Cable is good to go. Already tried rolling back and nada. Pushed back to .246 and still nada. Is there a way to start from scratch with a router? Like do a low level format of all the ram and re-upload firmware?

 

[jdabbs]

Modem port
Router port
Cable

You should individually verify that each of these still work at gigabit before suspecting a compatibility issue. I would have grabbed any gigabit capable device and patched it into the modem long before touching the config on the router. Do the same for the router WAN port.

 

[ConnYack]

Modem port
Router port
Cable

You should individually verify that each of these still work at gigabit before suspecting a compatibility issue. I would have grabbed any gigabit capable device and patched it into the modem long before touching the config on the router. Do the same for the router WAN port.

Tested all three. Arrived at the Router port as the culprit.

 

[SoCalReviews]

Disconnect the Ethernet cable between the router and the modem. Do a hard reset of the router by holding the reset button for fifteen seconds. Power cycle the 6120 cable modem and keep it unplugged for at least two minutes before powering it back on. Reconnect the Ethernet cable between the router WAN port and the modem and then power cycle the router (turn power button off for five seconds and then on). Try to go through the RT-N66U router setup again and see if the gigabit port works with the blue LED flashing on the modem.