Gateway none - Manual (Page 11)

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CHAPTER 1
VPN protocols - PPTP, L2TP and IPSec. These protocols
allow remote users to establish a secure connection to their
corporate network. If your service provider supports VPNs,
then any of these protocols can be used to create an
authenticated and encrypted tunnel for passing secure data
over the Internet (i.e., a traditionally shared data network).
The VPN protocols supported by the Gateway are briefly
described below:
*Point-to-Point Tunneling Protocol: Provides a secure
tunnel for remote client access to a PPTP security gate-
way. PPTP includes provisions for call origination and
flow control required by ISPs.
*Layer Two Tunneling Protocol - Includes most of the
features provided by PPTP, but has fewer overheads and
is more suited for managed networks.
*IP Security - Provides IP network-layer encryption.
IPSec can support large encryption networks (such as
the Internet) by using digital certificates for device
authentication