How do you flush an IP address?

I am trying to connect to a new cable modem but the IP address OS X keeps showing me in sys. prefs is incorrect so I get no connection. My local isp says it should begin with 242 and I keep getting 169..
I have tried the obvious resetting the modem, changing ethernet cords but that IP 169 will not go away.
any ideas?

>When I plug the cable modem into my PC..no problem it works fine, no need to adjust any setting.
My mac..ugh..no plug and play.
If the cable modem works when you plug in the PC, it won't work with anything else until the cable modem is reset (powered off).
Most cable modems lock themselves to the first device they seen when powered on. If that's the PC, then the PC is the only thing it's going to talk to until you power cycle it. It's a PITA and no one has ever been able to give a reasonable explanation as to why cable modems do this.
The typical solution if you have multiple machines and a cable modem is to connect a router to the cable modem - make sure the router is the only thing that the cable modem sees when it powers on and connect the various machines behind the router. As far as the cable modem is concerned, the only thing it's talking to is the router, so it's happy. The router takes care of splitting the traffic betweenthe multiple machines.

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