Services for Macintosh

Remote Access

Windows 2000 supports remote access, which permits remote clients to connect transparently to corporate networks or the Internet over the protocols that are listed in Table 13.9.

Table 13.9 Supported Remote Access Protocols

Protocol Name	Description
Layer Two Tunneling Protocol (L2TP)	A protocol used in conjunction with IPSec to create secure virtual private networks (VPNs).
Point-to-Point Protocol (PPP)	A protocol used for dial-up connections. PPP encapsulates IP, IPX, AppleTalk, and NetBEUI packets.
Point-to-Point Tunneling Protocol (PPTP)	A protocol extension to PPP that permits remote access to VPNs over TCP/IP.

The Point-to-Point Protocol (PPP) defines a method for encapsulating network layer protocol information over point-to-point links. The AppleTalk Control Protocol (ATCP) (RFC 1378) defines the Network Control Protocols (NCPs) used by the AppleTalk Protocol over PPP. ATCP follows the Link Control Protocol (LCP) for packet exchange, with some exceptions related to frame modification, the use of the data link layer protocol and code fields, timeouts, and configuration options.

ATCP is installed automatically if remote access and the AppleTalk Protocol (ATP) are installed. ATP is installed automatically when the file server and print server are installed. You can also install ATP separately.

ATCP supports the following:

Addresses are dynamically allocated.
Users do not have to change their passwords.
Client callback provided.
Guest account authentication and access authorization are the same as for other dial-up methods.
User passwords must be saved in reversibly encrypted cleartext format on the dial-up server.
For ATCP clients, the administrator must configure encrypted cleartext password storage for each user.