If you have a DSL line in your office and use a DSL modem to connect your business computers to the Internet, you might need to use the modem's Internet Protocol address. If you don't know the IP ...

The Modem has a MAC address that it presents to the cable service provider and the provider typically uses that MAC address to 'authenticate' the modem and then presents it with an IP address ...

If a computer is unable to configure a valid Internet Protocol address, it can't connect to a network. If you plug a laptop directly into a modem with an Ethernet cable and receive a "No Valid IP ...