3Com OfficeConnect 3CR414492, Getting Started Manual

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What Are the Features of This Product? 1-5
The following are new features for the current release:
SuperNAT
SuperNAT is an address translation protocol that is
activated when data packets arrive destined for a public
address that matches both NAT and PAT rules. SuperNAT
first tries to use NAT address translations. If this does not
work, PAT address translation is used. You can configure
SuperNAT from the Web pages or the CLI.
NOTE : You cannot use the public WAN port IP address of
the OfficeConnect 812 as one of the NAT or SuperNAT
static or dynamic public IP addresses.
Virtual Private Networks
A Virtual Private Network (VPN) is a computer network that
contains characteristics of a private network operating
through the public infrastructure, like the Internet. You can
use several tunneling and encryption protocols to configure
a VPN and ensure that data remains secure in a private
tunnel that simulates a point-to-point connection.
Tunneling Protocols
Tunneling allows workstations on one network to send
data by encapsulating it in an IP data stream. You use
tunneling to move data between administrative domains
that use a protocol not supported by the Internet that
connects those domains.
The following are tunneling protocols:
L2TP - Layer Two Tunneling Protocol, an extension to
the PPP protocol that enables Internet Service Providers
(ISPs) to operate VPNs. L2TP merges the best features of
two other tunneling protocols: PPTP from Microsoft and
L2F from Cisco Systems. Like PPTP, L2TP requires that
the ISP's routers support the protocol.
PPTP - Point-to-Point Tunneling protocol, ensures the
security of messages transmitted from one VPN to
another. Generic Routing Encapsulation (GRE), a
proposed protocol that encapsulates and transports the
data portion of packets as they are routed, is also