Siemens SCALANCE XM-400 Configuration Manual page 346

Configuring with Web Based Management
5.6 The "Layer 3 (IPv4)" menu
● Interface
Select an IP interface from the drop-down list on which you want to configure NAT.
As soon as you have configured an interface as a NAT interface, all other configurations
are considered starting from this interface. This means for this interface that all networks
reachable via the interface itself count as "Outside". All other networks are "Inside".
Note
If you have configured several NAT interfaces on a device, this means that a network is
"Outside" from the perspective of one NAT interface and "Inside" from the perspective of
another NAT interface.
● NAT
Enable or disable NAT for an IP interface.
An entry is created automatically in the "Pool" tab. The device can be reached from the
external network using the IP address of the IP interface.
If you disable NAT for an IP interface and there are no configurations on the NAT interface,
the entry is automatically deleted from the table.
● NAPT
Enable or disable NAPT for an IP interface.
The table has the following columns:
● Interface
Interface on which there is a NAT configuration.
● NAT
Shows whether NAT is enabled or disabled for the selected IP interface.
NAT is only enabled, when you have enabled NAT for the entire device.
● NAPT
Shows whether NAPT is enabled or disabled for the selected IP interface.
NAPT is only enabled, when you have enabled NAT for the entire device.
If you do not create any further configurations for NAPT, the dynamic port translation is
enabled automatically.
As default, a device in the internal network cannot be reached from an external network. If
the internal device wants to communicate in an external network, the inside local address
and the IP address of the IP interface have a port added and the internal device is assigned
as inside local and inside global address. Using this inside global address, the internal
device can be reached from the external network until the timer of the connection elapses.
Procedure
To configure NAT/NAPT proceed as follows:
1. Enter the required times.
2. Select the required IP interface.
3. Enable NAT/NAPT for the selected IP interface.
4. Click the "Set Values" button.
5. Make the settings you require for NAT/NAPT in the NAT/NAPT tabs.
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SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12