Specifications

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• Figure 52: Arctic's routing settings
14.8. Configuring the S-NAT settings of the Arctic
In this example configuration, there is no need for S-NAT since the M2M GW’s and Arctic’s LANs
are tunneled over VPN.
Note: In a private access point case, it is usually needed to enable S-NAT.
The typical use case for S-NAT would be that computers in Arctic LAN need to access Internet via
GPRS/EDGE connection. As the computers have private IP addresses (10.10.10.0/24 network), it
is not possible for them to access the internet.
With S-NAT, the Arctic will change the source IP address of the computer that needs to access the
Internet via GPRS to Arctic’s own IP address (masquerade). Respectively, while the packets are
coming back to intranet computer, Arctic knows to forward the packets to the correct host in Arctic’s
LAN.
Refer to page 70, chapter 17.6: Routing for more information on S-NAT/D-NAT.