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LANCOM Reference Manual LCOS 3.50 ̈ Chapter 14: Virtual Private Networks—VPN
292
Virtual Private Networks—
VPN
ᕣ The central LAN has a connection to the Internet so that its users can
access the Web, and send and receive e-mail.
All connections to the outside world are based on dedicated lines, i.e.
switched or leased lines. Dedicated lines are very reliable and secure. On the
other hand, they involve high costs. In general, the costs for dedicated lines
are dependent on the distance. Especially in the case of long-distance
connections, keeping an eye out of cost-effective alternatives can be
worthwhile.
The appropriate hardware must be available in the headquarters for every
type of required connection (analog dial-up, ISDN, leased lines). In addition
to the original investment costs, ongoing costs are also incurred for the
administration and maintenance of this equipment.
Networking via the Internet
The following structure results when using the Internet instead of direct
connections:
All participants have fixed or dial-up connections to the Internet. Expensive
dedicated lines are no longer needed.
ᕡ All that is required is the Internet connection of the LAN in the
headquarters. Special switching devices or routers for dedicated lines to
individual participants are superfluous.
Headquarters
Computers using remote access
Internet
ᕡ
ᕢ
ᕣ
LAN
LAN
Branch office