Fortinet fortigate-60r Installation Instruction

A Virtual Private Network (VPN) is an extension of a private network that 
encompasses links across shared or public networks such as the Internet. For 
example, a company that has two offices in different cities, each with its own private 
network, can employ a VPN to create a secure tunnel between the offices. Similarly, a 
teleworker can use a VPN client to gain remote access to his private office network. In 
both cases, the secure connection appears to the user as a private network 
communication, even though the communication is carried over a public network.

Secure VPN connections are enabled by a combination of tunneling, data encryption 
and authentication. Tunneling encapsulates data so that it can be transferred over the 
public network. Instead of being sent in its original format, the data frames are 
encapsulated within an additional header and then routed between tunnel endpoints. 
Upon arrival at the destination endpoint, the data is decapsulated and forwarded to its 
destination within the private network.

Encryption transforms data stream from clear text (something that a human or a 
program can interpret) to cipher text (something that cannot be interpreted). The 
information is encrypted and decrypted using mathematical algorithms know as keys. 

Authentication provides a means to verify the origin of a packet and the integrity of its 
contents. Authentication is completed using checksums calculated with keyed hash 
function algorithms.

This chapter provides an overview of how to configure FortiGate IPSec VPN. For a 
complete description of FortiGate VPN, see the FortiGate VPN Guide.

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