5-2 Administrator’s Handbook
Motorola Netopia® Embedded Software Version 8.7.4 can be used in VPNs either to initiate the connection or
to answer it. When used in this way, the Routers are said to be
tunnelling
through the public network (Internet).
The advantages are that, like your long distance phone call, you don't need a direct line between one computer
or LAN and the other, but use the local connections, making it much cheaper; and the information you exchange
through your tunnel is private and secure.
Tunneling is a process of creating a private path between a remote user or private network and another private
network over some intermediate network, such as the IP-based Internet. A VPN allows remote offices or
employees access to your internal business LAN through means of encr yption allowing the use of the public
Internet to look “vir tually” like a private secure network. When two networks communicate with each other
through a network based on the Internet Protocol, they are said to be
tunneling
through the IP network.
Unlike the phone company, private and public computer networks can use more than one protocol to carr y your
information over the wires. Several such protocols are in common use for tunnelling, Point-to-Point Tunnelling
Protocol (PPTP), IP Security (IPsec), Layer 2 Transpor t Protocol (L2TP), Generic Routing Encapsulation (GRE),
and Ascend Tunnel Management Protocol (ATMP). The Motorola Netopia
®
Router can use any of these.
•
Point-to-Point Tunneling Protocol (PPTP) is an extension of Point-to-Point Protocol (PPP) and uses a client
and ser ver model. Motorola Netopia
®
’s PPTP implementation is compatible with Microsoft’s and can
function as either the client (PAC) or the ser ver (PNS). As a client, a Motorola Netopia
®
Router can provide
all users on a LAN with secure access over the Internet to the resources of another LAN by setting up a
tunnel with a Windows NT ser ver running Remote Access Ser vices (RAS) or with another Motorola Netopia
®
Router. As a ser ver, a Motorola Netopia
®
Router can provide remote users a secure connection to the
resources of the LAN over a dial-up, cable, DSL, or any other type of Internet access. Because PPTP can
create a VPN tunnel using the Dial-Up Networking (DUN) (see
"Dial-Up Networking for VPN" on page 5-19)
utility built into Windows 95, 98, or NT, no additional client software is required.
•
IPsec
stands for IP Security, a set of protocols that suppor ts secure exchange of IP packets at the IP layer.
IPsec is deployed widely to implement Vir tual Private Networks (VPNs). IPsec suppor ts two encr yption
Transit Internetwork
Logical
Equivalent
Virtual Private Network
Summary of Contents for Netopia Embedded Software
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