Multitech MTCBA-H3-EN3-P1 User's Guide download pdf (Page 43)

Chapter 3 – Using the Web Management Software

43 Multi-Tech Systems, Inc. MultiModem rCell User Guide

Click Save after making changes. The defined DNAT configuration displays at the bottom of the screen.

Delete or edit settings by clicking the Edit or the Delete buttons.

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.

For this example, 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 screen, set up the following parameters and click Add.

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.

2. On the Network & Services > Service Configuration screen, define a service name and click Add. For this

example, the service will be a meter.

Name: Enter a name for the service (use a name that will identify the service for you). Example:

MeterPort

Protocol: Select a protocol. Example: tcp or udp

S-Port / Client: Enter the source port for this service. Example: 1:65535

D-Port / Server: Enter the destination port for this service. Example: 7700

3. On the Packet Filters > DNAT Configuration screen, define the DNAT rule.

Allow Access: Select the original target network/host of the IP packets that you now want rerouted.

The original target network/host is the one previously defined in the Network Configuration section.

Example: Any

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.

Pre DNAT Service: Select the service for the Pre-DNAT destination. This service was just defined in the

Service Configuration section. Example: MeterPort

Post DNAT IP: Select the destination to which the IP packets are to be diverted. Only one host can be

defined as the Post DNAT destination. Example: MeterIP

Post DNAT Service: Select the service for the Post DNAT configuration. Example: MeterPort

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. Example: NOCHANGE

4. Click Save to save the configuration.

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Multitech MTCBA-H3-EN3-P1 User's Guide Page 43