Specifications

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• Figure 53: Arctic's S-NAT settings
14.9. Configuring the D-NAT settings of the Arctic
In this example configuration, there is no need for D-NAT since the M2M GW’s and Arctic’s LANs
are tunneled over VPN.
A typical example of D-NAT would be when there are many Arctic’s with overlapping LAN
addressing. In such scenario, there may be hosts with the same private class IP address behind
different Arctics. It is not possible to arrange routing with same IP address space for several
Arctic’s.
Instead the VPN peer IPs would be used to differentiate the Arctics and each Arctic would do a D-
NAT for packets coming in to Arctics VPN peer IP. The D-NAT would then forward the packets to
the host(s) in the Arctic’s LAN based on e.g. the destination port or protocol.
Refer to page 70, chapter 17.6: Routing for more information on S-NAT/D-NAT.