Remote Access Protocols
In Windows 2003, you can establish a remote connection by using
either dialup remote access or a virtual private network (VPN).
To establish a remote access connection to a Windows 2003
network, you can select from the following remote access
protocols:
-
Dial-up protocols
-
VPN protocols
These remote access protocols are supported by Windows 2003 and
provide interoperability with third party remote access
components. Understanding the features of each protocol will
help you decide which protocol is appropriate for your network.
Dial-up Protocols
Windows 2003 supports dial-up remote access protocols, such as
Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol
(PPP), to provide clients with access to a variety of remote
access servers.
SLIP
SLIP allows remote access clients to connect to a remote access
server through a modem. This allows client computers running
Windows 2003 to connect to SLIP servers. A SLIP server is a
remote access protocol component on the remote access server
that services connection requests from SLIP clients.
Although client computers running Windows 2003 can connect to
SLIP servers, Routing and Remote Access does not itself include
a SLIP server component. Therefore, you cannot use a computer
running Windows 2003 as a SLIP server. Instead, you can use a
server running UNIX as a SLIP server. SLIP is an industry
standard protocol that addresses TCP/IP connections made over
serial lines. SLIP is supported by Routing and Remote Access and
gives clients running Windows 2003 access to Internet services.
SLIP has several limitations:
-
Support is limited to TCP/IP. You cannot use SLIP to
directly transfer other network protocols, such as IPX/SPX
or NetBEUI.
-
A static IP address is required. SLIP requires the client to
configure all of the TCP/IP configuration parameters, such
as the IP address, prior to establishing a connection to the
server.
-
It typically relies on text-based logon authentication
sessions and usually requires a scripting system to automate
the logon process.
-
It transmits authentication passwords as clear text. This
might result in a security compromise because passwords are
not encrypted during user authentication.
PPP
PPP is a set of industry-standard protocols that enable remote
access clients and servers to operate in a network consisting of
components manufactured by multiple vendors. PPP supports
encrypted password authentication. PPP is an enhancement to the
original SLIP specification and provides a standard method for
sending network data over a point-to-point link.
PPP support enables computers running Windows 2003 to connect to
remote networks through any server that complies with PPP
standards. PPP compliance also enables a server to receive calls
from, and provide access to, other vendors’ remote access
software. The PPP architecture enables clients to use any
combination of NetBEUI, TCP/IP, and IPX/SPX network transport
protocols. You can run applications written to the
IPX/SPX, NetBIOS, or Windows Sockets (WinSock) interface on a
remote computer running Windows 2003. The PPP architecture
enables a server to download and configure TCP/IP parameters
