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Getting a Motorola SBG6580 into “Bridge” mode

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Getting a Motorola SBG6580 into “Bridge” mode on TimeWarner Wideband

  1. Unplug coax cable from Motorola
  2. Hold down the white reset button on the back panel with a pen for 30s.  This resets all settings to factory defaults. The modem will be auto-reconfigured once you plug in the coax cable.
  3. When modem is back on plug in a computer with an Ethernet cable into the modem.
  4. Connect to and login with “admin” / “motorola”
  5. Now you will make some changes:
    • Wireless -> Primary Network -> Disabled
    • Basic -> Setup -> NAPT Mode -> Disabled
    • Basic -> DHCP -> No
    • Advanced -> Options -> Rg Passthrough -> Enable
    • Advanced -> Options -> Passthrough Mac Addresses -> Add WAN MAC address of your router 6. Connect port 1 on the Motorola modem to the WAN port of your router.
  6. Plug the coaxial cable back into the modem and power cycle it.

Thanks! This is perfect and exactly what I needed...

Or you could just use the "double-DHCP" trick. Plug your own device's WAN port into the Motorola port #1. Let it grab a default DHCP address of and offer route via Ensure your own router device is in another range like, usually by default. Set your DNS and configuration settings on your router device and plug all PCs into your own router. Don't plug anything into the Motorola except the WAN port which should connect to your router. You are then good to go :) Of course, you'll still want to disable the Motorola wifi if your own router has it already...

Wow, Thanks for sharing. This is exactly what I needed.

I don't recommend "double-DHCP" which is just an extra level of unnecessary NAT indirection.

Awesome! Thank you. This is exactly what I wanted/needed.

A note to anyone who follows these directions and can't get internet access initially:
I followed all the steps and had to power cycle the modem with the router still connected and on. WAN access didn't kick in for a minute or two but these instructions did work ^_^

Comcast pushed SBG6580- down to me and the next time the power dipped, bridge mode stopped working. "Rg Passthrough" is gone and despite all I've tried, I can't get the modem into bridge mode. Tried double NAT and my Airport router complained (but worked). Couldn't get Facetime to work, though. Motorola's firmware is just a mess. If I can't get this working, I may have to buy an Arris, probably a WBM760A.

When I Disable NAPT it go to a reload screen and I don't have access anymore. I have to reset to have access again. Any idea what's going on?

Is it possible to use as a bridge just with wifi connection? Not using the coaxial?


Worked perfectly. Thank you!

Thanks so much, this helped big time!

Awesome post. Much appreciated.

jryans commented

Thanks for this, very useful!

On my SBG6580, all I had to do was disable NAPT mode (click the Apply button immediately below it) and that switched it into bridging mode. The SBG6580's IP will then change to and you can login there if you need to. When you're ready, plug in the coax, cycle your modem, and plug it into your router's WAN port. It should work shortly thereafter.

THANK YOU!!! That's a really intuitive interface.

After turning of napt mode the interface ip changes to to log in. Otherwise I used the instructions and I'm typing this from one in bridging mode now.


I turned off NAPT but found I could only connect one computer. I have three in the home besides the Server. Or is this this only used for connecting a second Wireless Router? The first creates the Bridge and the second connects all your PCs?

I had the same results as cdmckay. I got it to work by disabling NAPT mode and thus the modem restarting. I can then access but there are no settings worth changing in there. I plugged my router into slot 1, unplugged the power from the SBG, plugged in the COAX and plugged the power back in. that is the order that I had to do in order for it to work. for AesopsRetreat I think the purpose of bridge mode is to disable the first router. Thus making it only act as a modem. Meaning your devices would have to be connected to the second router.

Thanks for all the comment (especially djstrikes3)! It worked as advertised. :+1: Once I plugged in the other router I bought, I was able to go to and log into the Motorola (as described above).

Once Motorola SBG6580 is in Bridge Mode, if the new router can't connect to the internet, then you might have to set the router's MAC address to match Motorola SBG6580's MAC address. This is because some ISPs only allow certain MAC addresses to connect.

In my case, I set my router's MAC address to the Motorola SBG6580's "GATEWAY MGMT MAC ID" and I was able to connect.

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