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Chapter 3 – Using the Web Management Software
Packet Filters > DNAT Configuration
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.
When adding rules, at least one host must be defined in the Network Configuration section.
Important Note:
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
The internal device can be camera, meter, security device, etc.
Note:
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
Situation:
7700.
On the
1.
Network & Services > Network Configuration
Enter a name for the LAN device.
Name –
IP Address and Subnet Address –
Click the Add button to save this configuration.
Add –
On the
2.
Network & Services > Service Configuration
service will be a meter.
Enter a name for the service (use a name that will identify the service for you).
Name –
Protocol –
S-Port / Client –
D-Port / Server –
Click the Add button to save this configuration.
Add –
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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 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.
Name = MeterIP
Example:
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.
MeterPort
Example:
Select a protocol.
tcp/udp
Example:
Enter the source port for this service.
1:65535
Example:
Enter the destination port for this service.
7700
Example:
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
Multi-Tech Systems, Inc. MultiModem rCell User Guide
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