User guide

Canopy System User Guide Network Address Translation (NAT)
pmp-0229 (Mar 2013)
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NAT without DHCP
The NAT without DHCP implementation is illustrated in Figure 52.
Figure 52: 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 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 and PPTP (Point to Point Tunneling Protocol) VPNs. With NAT disabled, SMs support all
types of VPNs.