How To Port-Forward Motorola SB5120 Modem When Using A Server


The ability to connect directly to the computer that is hosting the files is a must for the users that are hosting a server. You might already know that a router or a gateway is directing traffic towards specified local addresses. The Motorola SB5120 modem does not such a thing and this means that it doesn’t need a port-based configuration to host a server. That way, make sure that the server application has an exception through the Windows Firewall if the modem is directly connected to your computer. There are cases when you will need to set up a port-forwarding rule for your server application, meaning when the Motorola modem is behind a router.

By case, follow the instructions below:

In the case you are using DIRECT COMPUTER CONNECTION

  1. Try to use an Ethernet cable instead of an USB interface if possible, in order to connect the SB5120 to your computer. That cable needs to be connected to the back of the modem and the computer also.

  2. Access the “Start” menu and open the Firewall component. In order to open it, type “Firewall.cpl” into the “Search Program” field and then press “Enter”.

  3. On the left side you will see the “Allow a program or feature” link which you have to click. In the list there is a provided search for the application used for your server and check the box in front of it in order to select it. You will have to select the program manually if you don’t see it listed by clicking the “Allow another program”.

  4. In order to save, make sure to click the “OK” button and continue by running a server with the modem. Also, make sure you obtain the IP address that you need to provide to your clients if the type of the application will require this.

  5. The network address information will be displayed if you will follow the commands: press the “Windows” and “R” keys at the same time, then type “CMD” and press “Enter” key. Continue by typing “Ipconfig/all” into the “Command Prompt” and press “Enter”.

  6. Under the “Ethernet Adapter” section you will find the “IPv4 Address” that you have to forward to your users. Close the Command Prompt by typing “Exit” and then press “Enter”.

For the SB5120 WITH NETGEAR ROUTER case:

  1. Open the browser that you are navigating with, type into the address bar either “” or “” and press “Enter”.

  2. When prompted, provide your username and password and then click “OK”. Usually, the defaults are “admin” and “password”.

  3. Select “Advanced” and then click “Advanced Setup” that will expand a group of links.

  4. On the left pane you will find the “Port Forwarding/ Port Triggering” link. Click it and wait until it creates a Port Forwarding Table at the center of the screen.

  5. Create a forwarding rule for your server application by clicking the “Add Custom Service” button. It will open a second page that will be used to create that rule.

  6. You will have to type a rule name into the Service Name box and then open the “Protocol” option and select “Both”. Continue by typing in the port numbers that your service application uses in the “Port” fields.

  7. Search in the “Currently attached Devices” table for the radio button and click it, then select “Apply”. From that moment on the server traffic will go from the SB5120 to the Netgear and then to the computer.

  8. In order to obtain your IP address start by clicking “Advanced” and then “Administration” and it will expand several links.

  9. Access the “Router Status” link and go to the “Internet Port” section. Here you will find the “IP Address” which is your server address and it is possible that your clients to request that address.

Also for some of you SB5120 WITH LINKSYS ROUTER could be the case:

  1. Open the browser that you use to navigate and add “” to the address bar. Then, press “Enter”.

  2. You will also have to provide your username and password when prompted and then click “OK”. “Admin” and “password” are the default.

  3. To display the rules go to the “Applications and Gaming” menu and then click “Port Range Forwarding”. It will display the rules at the center of the page.

  4. Go to the “Application Name” box and type a rule name. Then, you must enter the port numbers also in the Start and in the End port box.

  5. Into the “Protocol” menu select the “Both” option. Type your local IP address into “To IP Address” field. In order to use the rule check the “Enabled” box and then save by clicking “Save Settings”.

  6. Find your server IP address by accessing the “Status” tab and searching into the “Internet IP Address” section. There is the place where your server IP is.

Another option is when using SB5120 WITH D-LINK ROUTER:

  1. Start by opening the browser which you are usually navigating and enter “” in the address bar.

  2. When prompted, provide your username and password and confirm by clicking “OK”. It has a default username as “admin” but it doesn’t have a default password.

  3. Select “Advanced” and then “Port Forwarding”. In the “Name” box make sure you type your server software’s name.

  4. In the Start and End boxes you will have to enter the port numbers to forward. Then, expand “Traffic Type” and select “Any”.

  5. Continue by accessing “Schedule” and then select the “Always” option. In order to save click the “Save Settings” button.

  6. Search for your server IP and start by clicking “Status” and then look into the “WAN” section. You will find the server IP next to the IP address.

Last but not least there is a SB5120 WITH BELKIN ROUTER. Here is how you handle this situation:

  1. Open a browser and type into the address bar the “” IP. Then press “Enter”.

  2. Select the “Login” option and continue by providing your password. You must know that Belkin doesn’t have a password by default and it is advised to leave that field blank in that case.

  3. On the left side, under the Firewall section you will find “Virtual Servers”. Click it and display the rule table.

  4. Check the “Enable” box and then type a name in the “Description” field. At the same time make sure you type the port numbers for the software in the “Port” fields.

  5. Go to “Type” option and select “Both”, then go to the “Private IP Address” box and enter your IP in it. To confirm, click “Apply Changes”.

  6. Look into the “Internet Status” section which is into the “Status” menu. Just like above you will find the server address beside IP Address.

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