InHand VG710 - 5.5.2 Network Address Translation (NAT)

InHand VG710 InVehicle Gateway User Manual
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5.5.2 NAT
Network address translation (NAT) can be used when some hosts on a private network have been
assigned with local IP addresses (that is, private IP addresses used only on the private network), but
expect to communicate with hosts on the Internet (without encryption).
Common scenario: A user expects to access a camera on the LAN of the device through the public
network to view the current driving conditions of the vehicle. The camera address is 192.168.2.100,
and the open port 18000 provides video services.
1. Click "Firewall >> NAT", and select "DNAT" for "Action", and "Outside" for "Source Network".
Select "IP PORT to IP PORT" or "INTERFACE PORT to IP PORT" for "Translation Type". The
public IP address obtained through dial-up is not fixed, so "INTERFACE PORT to IP PORT" is more
convenient. Select "TCP" for "Transmit Protocol" because video services are transmitted over TCP.
Select "cellular 1" (dialup interface for the cellular network) for "Interface" and set "Port" to "20000".
Set "IP Address" and "Port" under "Translated Address" to "192.168.200" and "18000" respectively.
Click Apply & Save.
The gateway redirects the TCP service destined for port 20000 of the cellular 1 interface to the internal
IP address 192.168.2.100 and port 18000, to enable access to the internal services.