Vpn Basics; Introduction To Vpn; Vpns Vs Fixed Connections - D-Link DFL-1600 User Manual

20

VPN Basics

20.1

Introduction to VPN

Long gone is the time when corporate networks were separate isles of local
connectivity. Today, most networks are connected to each other by the
Internet. Issues of protecting the local networks from Internet-based crime
and intrusion are being solved by firewalls, intrusion detection systems,
anti-virus software and other security investments. However, business is
increasingly often being done across the Internet as a means of efficient and
inexpensive communication.
As we all have learned the hard way, not all parts of the Internet can be
trusted in our time. Private interests as well as corporate communication
requirements necessitate a means for data to be able to travel across the
Internet to its intended recipient without allowing anyone else to read or
alter it. It is equally important that the recipient can verify that no one is
falsifying information, i.e. pretending to be someone else.
VPNs, Virtual Private Networks, provide a very cost efficient means of
establishing secure links to parties that wish to exchange information in a
trustworthy manner.
20.1.1

VPNs vs Fixed Connections

Using leased lines or other non-public channels to exchange data between
organizations is not a new concept. It has been done since the first
193