What's the ADSL device to use to host a software firewall on a normal PC
I have an ADSL modem that I would like to replace with a computer that has a firewall on it (Pfsense) and I would like to know what kind of device to use on this PC in order to connect to the ISP. Would a USB Modem or faxmodem work? or there's something else that work.
My ADSL Modem is connected with a normal PSTN line.