How to set old router as modem for pfSense

I was thinking about installing pfSense on my old computer to put it to some good use. However, as I am pretty bad with networking, I run into an issue. If I am not mistaken about this, I am supposed to use my old router as a modem, then connect it to the computer acting as the new router. How do I set my router to work only as a modem? Is it something that it will do automatically?

Thanks in advance!

Most home routers have a built in modem. Decent routers have somthing called bridge mode this turns the router effectively into a modem only device and passes the connection to your pfsense box.

You need to give us more info. Is this ADSL? Cable? What ISP (some us ones are very restrictive).

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Sorry for being vague. I have an ADSL connection and the cable is cat5e (I'm assuming that's what you asked for). As for ISP, I live outside the US, so I don't really think it could help you.

Good. In that case get yourself a tp-link 8817 rather than your current router. I use this on BT its great, cheap, never goes down and can be put in bridge mode easily.

http://www.amazon.co.uk/gp/aw/d/B003FZ3QSK

Thanks a lot!