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Network Setup
On this screen you can set up DNAT re-routing. DNAT (Destination Network Address Translation) allows you to
place servers within the private network and make them available for a certain service to the public network.
Normally the network has a server running on the LAN, providing a network service, with an address in the
specified range and wants this service accessible to the outside world. DNAT process running on the
MultiAccess translates the Destination address of incoming packets into the address of the real network server
on the private network. The packets then get forwarded.
Note that for DNAT support, the TCP and/or UDP settings must be enabled (at Networks & Services >
Services > Protocol).
You cannot add a DNAT rule with the Pre DNAT Network as ANY, with Service as ANY, and a
Important:
Destination Service as ANY. All the packets will be routed to the system with Post DNAT network, and then the
services in the MultiAccess will not function properly.
Add DNAT Definition
The DNAT screen contains four drop down list boxes. The first two define the original target of the IP
packets that are to be re-routed. The last two define the new target to which the packets are forwarded.
From the drop down list boxes, select IP packet characteristics to be translated.
Pre DNAT Destination
Select the original target host or network of the IP packets that are to be re-routed. The network must
be predefined in the Networks menu.
Post DNAT Destination
Select a host to which the IP packets are to be diverted. Only one host can be defined as the Post
DNAT destination.
Important:
Service definition as you entered in the Pre DNAT Service.
As the address conversion takes place BEFORE the filtering by the packet filter rules, you
Note:
must set the appropriate Packet Filter Rules to let the already translated packets pass. You can
find more about setting packet filter rules later in this chapter.
Add, Edit, Delete
Click the Add button to save your choices. After saving the settings, a table is created. You can edit or
delete entries by highlighting the desired entries and clicking either the Edit or Delete button listed
under Command.
MultiAccess Communications Server MA30120 User Guide
> DNAT
If you are using a port range as the Post DNAT Service, you must enter the same
Chapter 3 – Software
Network Setup > DNAT
64
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