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
- Unplug coax cable from Motorola
- 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.
- When modem is back on plug in a computer with an Ethernet cable into the modem.
- Connect to http://192.168.0.1 and login with “admin” / “motorola”
- 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.
- Plug the coaxial cable back into the modem and power cycle it.
@electroman00... Because people's needs change. I bought my SBG6580 before I had a roommate who liked trading copyrighted stuff using BitTorrent. Comcast put me on notice of violation and I couldn't trust the roommate to voluntarily stop his activity. I needed to put a router between the roommate and the Internet that allowed for application blocking. Since the SBG6580 firmware provided no reasonable avenue for that I ended up putting it into bridge mode and setting up a dd-wrt router behind it that allowed application blocking (among other things). It was either that or find a new roommate. The bridging option seemed easier.