Eicon Networks SHIVA 1100, Administrator'S Manual, Page: 68 / 136

Overview
68 System Administrator’s Guide
Overview
Virtual Private Networking (VPN) enables two or more locations to communicate
securely and effectively, usually across a public network (e.g. the Internet) and has the
following key traits:
• Privacy - no one else can see what you are communicating
• Authentication - you know who you are communicating with
• Integrity - no one else can tamper with your messages/data
Using VPN, you can access the office network securely across the Internet using
Point-to-Point Tunneling Protocol (PPTP), IPSec, GRE or L2TP.
VPN technology can also be deployed as a low cost way of securely linking two or
more networks, such as a headquarters LAN to the branch office(s). IPSec is generally
the most suitable choice in this scenario.
With the Shiva VPN Gateway you can establish a VPN tunnel over the Internet using
either PPTP, IPSec, GRE or L2TP. IPSec provides the best security; however PPTP
is the preferred protocol for integrating with existing Microsoft infrastructure. GRE and
L2TP VPNs will generally be used for specialized purposes only.
Using the Shiva VPN Gateway's PPTP client or IPSec you can also connect your
office network to one or more remote networks.
The Shiva 1100 VPN Gateway provides both a PPTP and L2TP servers which enable
remote Windows clients to securely access your office network.
(new picture needed here when updated graphics become available)
Remote network Local network
Shiva 500 VPN Gateway
Internet
Internet
VPN tunnel
Shiva 21xx or 31xx
VPN Gateway