SBG6400 (v1.3.x): Port Filtering Setup

There may be situations in which it is desired to block all devices on the network from connecting to specific Internet services.  Port Filtering provides this functionality.  Port Filtering is not enabled by default.  This document describes how to enable and configure Port Filtering.

NOTE: Port Filtering can only be configured to block outbound access to all devices on the LAN and not specific devices.

To Configure Port Filtering

1. Launch a Firefox or Safari browser.  Enter http://192.168.0.1 into the address box, and press the Enter key.  
   
   NOTE: A browser message on Chrome, Edge, Firefox, and Opera, may appear when accessing the Web Manager.  The message includes 192.168.01 uses an unsupported protocol and ERR_SSL_VERSION_OR_CIPHER_MISMATCH.  The Web Manager uses an earlier version of the TLS protocol and does not match the version allowed by the web browser.  Safari browsers on Apple PC and mobile devices are not impacted.  The workaround to access the Web Manager with a PC is to use the Firefox browser and set the TLS version to 1.  For workaround instructions refer to article # 19435 - 192.168.0.1 uses an unsupported protocol.
    
2. A security or private risk alert may appear on the web browser advising users to proceed with caution when accessing the Web Manager.  There is no risk in proceeding to the Web Manager.  For instructions to bypass the alert screen, refer to article # 18181 - Alert Message for Web Manager Access.
    
3. On the Login page, enter admin or a customized username in the Username field.
    
4. Enter password or a customized password in the Password field.
   
   NOTE: On later versions of the SBG6400, the Wi-Fi Security Key is used as the default admin password printed on the bottom white label.  For assistance with Web Manager Access, refer to article # 18730 – SBG6400: Web Manager Access.
   
   
    
5. Click the Login button.  The Home page will appear.
   
   
    
6. Move the mouse cursor over the Advanced tab and select Port Filtering from the drop-down submenu.  The Advanced - Port Filtering page will appear.
   
   
    
7. On the Advanced - Port Filtering page:
   a.   Start Port: 
         If one port needs to be blocked, enter the port number. 
         If a range of ports needs to be blocked, enter the first number of the range.
   b.   End Port: 
         If one port needs to be blocked, enter the same port number that was entered as the Start Port. 
         If a range of ports needs to be blocked, enter the last number of the range.
   c.   Protocol - Click on the drop-down menu and select the appropriate protocol (TCP, UDP, or both).
   d.   Enabled - Click this checkbox to enable the gateway to block the ports entered in this entry.
   e.   Click the Apply button.
   
   NOTE: The example below shows two port filtering entries: One for a single port (25), and the other for a range of ports (2000-2005).
   
   

The SBG6400 Cable Gateway is now configured to use Port Filtering.