Bausch Datacom DinBox RTU M4 Reference Manual page 23

Routing
Configuration of the basic router working mode. This mode will make a transparent IP
connection from the Ethernet port to the connected mobile network.
Outgoing traffic (LAN→WAN) via standard IP Masquerading
Incoming traffic (WAN → LAN)
• Filter
• NAT
Remote Services
•
Remote HTTP access
• Remote TELNET
Only allow connections from the given subnet (ip address and
netmask, use netmask 255.255.255.255 to only allow one specific
IP address).
Configure port forwarding for the NAT in the modem. Ethernet
interface is the private network, mobile network is the public
network. Don't forget to "Enable" the configured Port.
Configure the Port on which the HTTP server is
available (for accessing the configuration GUI). Radio
button makes the port available on the public network.
Configure the Port on which TELNET is
available. Radio button makes the port available on
the public network.