Question about Arris Surfboard Sb6121 Cable Modem sb6121

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On a motorola SB6121 can I do port forwarding?

Motorola SB6121 can I do port forwarding?

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Is there a WPS button on my Motorola SB6121 Modem?

I don't see it in the picture searching, but if this function will be able, you will see special button for it somewhere on your modem.

Feb 19, 2015 | Motorola Computers & Internet

1 Answer

How do I find the bridge mode in sb6121

The Motorola Surfboard SB6121 is a cable modem only - no router included.

You must have a router - after the modem - in the network if you need router duties.

There is no bridge mode in the modem. Bridging the modem basically bypasses the routing function of the device and passes everything on to the next device in line......the router in this case.

Since this modem does not have a router built in - it is always in bridge mode.

Feb 03, 2015 | Arris Sb6121 Docsis 3.0 Cable Modem...

1 Answer

Why is the power and internet led white?

For troubleshooting it is best to contact ARRIS

Motorola Support

Aug 17, 2014 | Arris Surfboard Extreme Sb-6121 Docsis 3.0...

1 Answer

Why Motorolla SB6121 receive light won't steady

Contact ARRIS might be that it cannot link up properly. A comcast tech might need to come out and check it.

Jul 08, 2014 | Arris SB6121 SURFboard DOCSIS 3.0 eXtreme...

1 Answer

SURFboard DOCSIS 3.0 boosting the wifi signal

The SB6121 doesn't have WiFi, but I used a wifi extender (~$40-$80) to boost the wifi signal of my current wireless router that's attached to the SB6121.

Sep 20, 2013 | Arris SB6121 SURFboard DOCSIS 3.0 eXtreme...

1 Answer


The SB6121 link light uses color to indicate the connection speed. Blinking means data transfer is taking place. Blue means that it's a 1000Base-T (High-speed Gigabit Ethernet). Amber means it's an older ethernet device. 100Base-T or 10Base-T Ethernet connection.

Nov 06, 2012 | Arris SB6121 SURFboard DOCSIS 3.0 eXtreme...

1 Answer

Does the motorola sb6121 have a router built in?

Well, I'm not sure exactly what you mean by router, but I can tell you that it only has one physical ethernet port, not 3 or 4. It does have a built-in DHCP server, which means that if you have more than one computer connecting through it (using a wireless access point, for instance), it can assign each of them a separate IP address. The setup guide is here:

Jan 28, 2012 | Motorola SURFboard Computers & Internet

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