User's Manual Part 2
Release8PlanningGuide
Issue2,November2007 Draft5forRegulatoryReview 161
NAT without DHCP
The NAT without DHCP implementation is illustrated in Figure 44.
Figure 44: NAT without DHCP implementation
13.3.2 NATandVPNs
VPN technology provides the benefits of a private network during communication over a
public network. One typical use of a VPN is to connect remote employees, who are at
home or in a different city, to their corporate network over the 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, but do not support PPTP (Point to Point Tunneling Protocol) VPNs.
With NAT disabled, SMs support all types of VPNs.