Installation Guide

Table Of Contents
Task 2: Configuring IP and Ethernet interfaces PMP 450i and PTP 450i Configuration and User
Guide
NAT without DHCP
Figure 10 NAT without DHCP implementation
NAT and VPNs
VPN technology provides the benefits of a private network during communication
over a public network. One typical use of a VPN is to connect employees remotely
(who are at home or in a different city), with their corporate network through a
public Internet. Any of several VPN implementation schemes is possible. By design,
NAT translates or changes addresses, and thus interferes with a VPN that is not
specifically supported by a given NAT implementation.
With NAT enabled, SMs support L2TP over IPSec (Level 2 Tunneling Protocol over
IP Security) VPNs and PPTP (Point to Point Tunneling Protocol) VPNs. With NAT
disabled, SMs support all types of VPNs.
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