Figure 7.5. SAT Address Translation
If internal clients require access to the public Internet, a NAT rule is also needed and the source
interface of the SAT rule must be set to any. The correct second rule for the external or internal
traffic is then selected based on the source interface.
# Action Src Iface Src Net Dest Iface Dest Net Service SAT Action
1 SAT any all-nets core wan_ip http-all Destination IP: 10.10.10.5
2 Allow wan all-nets core wan_ip http-all
3 NAT lan lan_net any all-nets http-all
Here, only one SAT rule is needed and once it triggers it will be used with whichever rule is
triggered next. The ordering of the Allow and NAT rules does not matter but they must be found
after the SAT rule.
If the web server is on the same network as the client, a different approach is required where the
SAT rule is paired with a NAT rule and this is described later in Section 7.4.9, “SAT with NAT”.
7.4.3. Many-to-Many IP Translation
A single SAT rule can be used to transpose an entire range or network of IP addresses to another
range or network. The result is a many-to-many translation where the first original IP address is
translated to the first IP address in the new range or network, then the second to the second, and
so on.
To tell NetDefendOS to perform this type of translation, the original IP address must be a range
or network and the IP rule's All to One property must be disabled. The new range or network is
specified using a single IP address which is the starting address for the transposition. For
example, 192.168.1.0 would be specified as the new address if the transposition is to the network
192.168.1.0/24 and starting from the first address in the network.
As another example, a SAT IP rule might specify that connections to the 194.1.2.16/29 network
should be translated to 192.168.0.50. The IP rules for this would be:
# Action Src Iface Src Net Dest Iface Dest Net Service SAT Action
1 SAT any all-nets core 194.1.2.16/29 all_services Destination IP: 192.168.0.50
2 Allow any all-nets core 194.1.2.16/29 all_services
Chapter 7: Address Translation
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