Getting a Motorola SBG6580 into “Bridge” mode

gistfile1.md

found at: http://fascinated.fm/post/2379188731/getting-a-motorola-sbg6580-into-bridge-mode-on

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 http://192.168.0.1 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.

@cdmckay's comment mostly did it for me BUT I also needed to set wireless to off. Another issue was that my new separate router wasn't broadcasting any networks, which I thought was the fault of the SBG6580, but actually I had to factory reset my router and then it broadcasted its networks.
So in full, these steps worked for me:

1. unplug coax cable
2. reset SBG6580
3. connect computer with SBG6580 via ethernet (although this could've been done from the beginning too)
4. connect to 192.168.0.1 and enter "admin" and "motorola" (or whatever else you set these to)
5. set
   -Wireless to Disabled (not just the primary network!)
   -Basic -> Setup -> NAPT mode to Disabled
6. if you still need access to the landing page, use 192.168.100.1 . Otherwise, plug in the coax cable, take out the ethernet cable to your computer and power cycle it
7. connect the SBG6580 in bridge mode with the new router via ethernet cable and then factory reset the new router if necessary
   ezpz