[PLUG] New Comcast wireless modem with old Buffalo wireless router

[Walt Mankowski <waltman@pobox.com>]

I've been a Comcast internet customer since 2012.  Recently they told
me my old modem will longer be supported after January, and a few days
ago they sent me a brand new XB3 modem.

Currently I've got my old modem plugged into a Buffalo WZR-600DHP
AirStation running DD-WRT.  I've got a desktop and a laptop plugged
into its RJ-45 ports, and it also handles a bunch of wireless devices.

I'm concerned because this new modem is also a wireless router.  If I
just replace the old modem with the new one, will everything still
work?  Or do I need to consolidate and move all my settings from the
Buffalo router onto the Comcast device?  Has anyone tried this before?
I'm also concerned that if I mess anything up, the old modem will have
been deactivated and I won't easily be able to fall back once I start.

Thanks.

Walt

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