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Chapter 3 – Using the Web Management Software
64 MultiModem rCell User Guide
Packet Filters, DNAT Configuration Parameters
DNAT Configuration Group
Destination Network Address Translation (DNAT) allows you to place servers within the protected network and
make them available for a certain service to the outside world. The DNAT process running on the router translates
the destination address of incoming packets to the address of the real network server on the LAN. The packets are
then forwarded.
You can Delete or Edit a DNAT rule after it has been defined and added by using the table at the bottom of the
screen.
Note: When adding rules, at least one host must be defined in the Network Configuration section.
Allow Access: Select a network or host to which IP packets are allowed and re-routed. The network/host must be
pre-defined in the Network Configuration section.
External Service: Select the External Service that you want allowed. The service must be defined in the Service
Configuration section.
LAN IP: Select the LAN IP to which the packets are to be diverted. Only one host can be defined as the
destination.
Internal Service: Select the Internal Service to be the destination.
Internal Source: Select the source address for packets that are going to be sent. If you do not want to change the
address, select NOCHANGE.
Save Button: Click Save. The defined DNAT configuration is added and appears at the bottom of the page. Entries
can be deleted or edited by clicking the Edit or the Delete buttons.
Example: Setting Up DNAT and Port Forwarding to an Internal Device
Note: The internal device can be camera, meter, security device, and so on.
Situation: Assume the device is on a LAN with an IP address of 192.168.2.100 and the port to access the device is
port 7700.
1. In the Network & Services > Network Configuration group, define the following parameters:
Name – Enter a name for the LAN device.
IP Address and Subnet Address – Enter the IP address and subnet address of the device.
Example: Name = MeterIP
IP Address = 192.168.2.100
Subnet Address = 255.255.255.255. The subnet mask in the network configuration is not defined using x.x.x.x
notation. It uses ‘bit’ notation. So 255.255.255.255 = 32.