The best place to find specific instructions for configuring the WAN side of a modem, router, or other network control device is in the information provided by your ISP. Specifically, when you set up a new ISP account, you should obtain your connection's static IP address or DHCP setting, the DNS server addresses, the subnet mask, and the gateway address. The ISP will probably give you addresses and a password for your email account at the same time, but you don't need them to configure the network connection (although you will need them to send and receive messages).

If your ISP requires a login and password every time you connect, you will need a router or modem that uses the same set of connection rules (the protocol) that your ISP's equipment expects. If your ISP does not provide a modem, ask them for a list of compatible makes and models.

The LAN side of the router uses addresses and other settings that don't extend beyond your own network, so your network can use the same settings as your neighbor's network. Therefore, many manufacturers ship their routers with preset addresses that should work for most networks. The user's manual or setup guide supplied with the device usually contains step-by-step instructions for changing the settings. If you can't find a printed copy of the manual, look for one on the manufacturer's website.