Справочник Пользователя для WatchGuard Technologies BF4S16E5W

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User Guide
  105
CHAPTER 9
VPN—Virtual Private 
Networking
This chapter tells how to use the VPN with IPSec upgrade option 
of the WatchGuard SOHO 6 Wireless.
Why create a Virtual Private Network?
Use a VPN tunnel to make an inexpensive and secure connection 
between the computers in two locations. Expensive, dedicated 
point-to-point  connections are not necessary for a VPN 
connection. A VPN tunnel gives the security necessary to use the 
public Internet for a private virtual connection between two 
locations.