Reference11r1:IP4/NAT/General
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If the device is used as a router, it is able to connect IP terminals from the network with a non-public address to the public Internet. For this, NAT (Network Address Translation) is necessary. Additional configuration is required on the different IP interfaces (e.g. ETH, PPP, etc.) to define on which interfaces the public and on which interfaces the private network is accessed.
| Enable NAT | If this checkmark is set, NAT is enabled. Without this checkmark being set all other NAT settings are without effect. |
| Enable STUN | If this checkmark is set, a STUN server is started on the box. The STUN server works like a regular STUN server from external. From internal binding requests create a NAT mapping and the binding response contains the public address of the mapping. Note that the STUN server is part of the NAT module, hence Enable NAT must be ticked too for the STUN server to work. |
| Non standard port | The port that shall be used for the STUN server. If empty the well known port 3478 is used. |
| Default forward destination | If all incoming data packets from the public network are to be forwarded to a particular private IP address, the destination IP address must be entered here. |
| Port-specific forwarding | To be able to address several internal destinations, different port numbers are assigned to IP addresses of the internal network here. |