How to setup a netgear Cable Modem in bridge mode

I have a Netgear Cable Modem model CG3100D-28PAUS and need to set it up in bridge mode so I can attach another high spec router to it to control internet traffic and VOIP.

How do I configure this to be a bridge?
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I read spanish guide here:
There seems to be no way to enable passthrough via web interface.
Official best way you can proceed is to designate new router as DMZ host and disable radio on old router.
Undocumented way would be to telnet/ssh using your router admin password and try to find the way to disable NAT on uplink interface.
Even less official would be to use some hacks to get to real command line (ask google for broadcom shell bypass), but you need to have huge Linux expertise to handle that, and even then you may fail (it is documented for other routers of same BCM338031 platform that have unrestricted shell behind telnet)

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Davis McCarnOwnerCommented:
gheist did a nice job; but, left out one important detail.  Before you add your router to the DMZ (which will accomplish what you want), reserve its ip address for it so it stays put.
How to do both are in the advanced section of the manual he provided a link to.
BTW, bridge mode really only applies to DSL (for the most part).
There is explanatory text in website snapshot setting up DMZ in that Spanish guide advising to make static DHCP entry. Criticism taken, i will translate next time.
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