Multitech MultiModem rCell User Manual page 43

6 1 B P acket Filters > DNAT Configuration
9 0 B
Destination Network Address Translation (DNAT) is a process that allows the placing of servers within the protected network
and making 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.
Important Note: When adding rules, at least one host must be defined in the Network Configuration section.
DNAT Configuration
Allow Access:
External Service:
LAN IP:
Internal Service:
Internal Source:
Save Button:
Packet Filters > DNAT Example
Set Up DNAT and Port Forwarding to an Internal Device
Note: The internal device can be camera, meter, security device, etc.
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. On the Network & Services > Network Configuration
Name –
IP Address and Subnet Address –
Add – Click the Add button to save this configuration.
2. On the Network & Services > Service Configuration
service will be a meter.
Name –
Protocol –
S-Port / Client –
D-Port / Server –
Add – Click the Add button to save this configuration.
Multi-Tech Systems, Inc. MultiModem rCell User Guide
Select a network or host to which IP packets will be allowed and re-routed. The network/host
must be pre-defined in the Network Configuration section.
Select the External Service that you want allowed. The service must be defined in the Service
Configuration section.
Select the LAN IP to which the packets are to be diverted. Only one host can be defined as the
destination.
Select the Internal Service to be the destination.
Select the source address for packets that are going to be sent. If you do not want to change the
address, select NOCHANGE.
Click the Save button. The defined DNAT configuration is added and will display at the bottom of
the screen. Entries can be deleted or edited by clicking the Edit or the Delete buttons.
Enter a name for the LAN 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.
Enter a name for the service (use a name that will identify the service for you).
Example: MeterPort
Select a protocol.
Example: tcp or udp
Enter the source port for this service.
Example: 1:65535
Enter the destination port for this service.
Example: 7700
Chapter 4 – Using the Web Management Software
screen, set up the following parameters:
Enter the IP address and subnet address of the device.
screen, define a service name. For this example, the
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