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VPN Connections
36 NetWAYS/ISDN – 3 Remote Access with NetWAYS/ISDN
3.5 VPN Connections
NetWAYS/ISDN allows you to set up Virtual Private Network
(VPN) connections. VPN connections are an economical way
to connect remote PCs to the company LAN. Until recently,
remote systems were usually interconnected using direct
dial-up or leased line connections over public telecommuni-
cation networks, such as ISDN or GSM. However, the costs
for direct dial-in increase with the distance to be bridged. In-
ternational connections in particular can be very expensive.
Today, systems separated by long distances can be econom-
ically linked by VPN connections.
VPNs in General
A remote stand-alone computer is connected to the company
LAN by a VPN link transported over the Internet.
Example: a VPN connection over the Internet
The private connection carried over the public Internet be-
tween the two communicating parties is called a tunnel. The
two networks exchange data through this tunnel. The remote
stand-alone computer and the company LAN do not share a
physical network connection: the shared network is a virtual
one. This virtual network is a higher-order data structure that
uses the existing public infrastructure of the Internet for data
transport. The other interfaces and applications of the two
connected systems are not affected by the VPN link. The con-
nection is economical because both sites only incur charges
for a connection to an Internet Service Provider.
Local Network
Remote stand-alone
computer with
NetWAYS/ISDN
VPN Tunnel
netways-e.book Seite 36 Freitag, 28. November 2003 3:51 15
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