For dial-up networking access, the dial-up server must have at least one modem or a multiport adapter and analog telephone lines or other WAN connections.

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Connect using a modem, ISDN adapter, or other physical device

A dial-up connection connects you to a network or the Internet through a device that uses the telephone network. This device can be a modem that uses a standard phone line, an ISDN adapter with a high-speed ISDN line, DSL, broadband, or a cable modem.

Connect using a virtual private network (VPN)

A virtual private network (VPN) extends the capabilities of a private network to encompass links across shared or public networks such as the Internet. With a VPN, you can send data between two computers across a shared or public network in a manner that emulates a point-to-point link on a private network.

Connect using PPP over Ethernet (PPPoE)

Using Point-to-Point Protocol over Ethernet (PPPoE) and a broadband modem, LAN clients can gain individual authenticated access to high-speed data networks. By combining Ethernet and Point-to-Point Protocol (PPP), PPPoE provides an efficient way to create a separate connection to a remote server for each user. Access, billing, and choice of service are managed on a per-user basis, rather than a per-site basis. Clients can create both dial-up and dial-on-demand connections using PPPoE.

Additional references