SBG6580 (v8.5.x): DMZ Host Setup

How do I setup a DMZ Host in the SBG6580 Cable Gateway? 

The DMZ Host feature allows the Gateway to forward all externally initiated IP traffic (TCP and UDP protocols only) to a default host on the LAN.
This document contains the following sections:

• Enabling the DMZ Host
• Disabling the DMZ Host

NOTE: If the DMZ Host feature has been enabled, and now it is desired to disable it, skip down to the Disabling the DMZ Host section.

The following are a couple scenarios in which DMZ Host is useful:

• When the port number or protocol in an in-bound application cannot be anticipated. For example, some network games select arbitrary port numbers when a connection is opened.
• When all unsolicited traffic needs to be forwarded to a specific LAN host.
• When an application does not work well with port triggering.

NOTE 1: It is recommended to manually configure the TCP / IP settings on the server that will be the DMZ host.  If this is done, then it is mandatory to configure the following settings:

• IP address
• Subnet mask
• Default gateway
• At least one DNS address

If these settings are configured without the default gateway, remote access to the server will not be available, as it will only be accessible from the local network.

NOTE 2: When manually configuring the TCP / IP settings on a device, make sure that the DHCP pool in the SBG6580 doesn't include the IP address of the DMZ host.  To verify or to adjust the DHCP pool, please refer to Answer # 8920 - SBG6580 (v8.5.x): LAN Subnet Setup.
 

Enabling the DMZ Host

1. Launch a web browser, such as Internet Explorer, Firefox, or Safari.  Enter http://192.168.0.1 into the address box, and press the Enter key.  The Login page appears.
   
   NOTE: By default the LAN IP address is 192.168.0.1.  If the default address has been changed, enter the custom address in the address box.
    
2. On the Login page:
   a.   Enter admin in the Username field.
   b.   Enter motorola in the Password field.
   c.   Click the Login button.  The Home page appears.
   
   NOTE: On firmware version 8.9.0.4 and later, the default admin password is required to be changed.  The Change User Password prompt will immediately appear after logging into the Web manager with the default admin password.  For assistance with the Change User Password screen, please refer to article # 18055 - SBG6580 (v.8.9.x): Prompt to Change Default Admin Login.
    
   
    
3. Move the mouse-cursor over Advanced on the top menu, and select DMZ Host.  The Advanced - DMZ Host page appears.
4. On the Advanced - DMZ Host page:
   a.   DMZ Host -  Enter the IP Address of the DMZ Host. For example: if the IP address of the server is 192.168.0.2, then enter 2.
   b.  Click the Apply button.
   
        
    

The SBG6580 Cable Gateway is now configured to enable a specific device on the LAN to be the DMZ host.
 

Disabling the DMZ Host

1. Launch a web browser, such as Internet Explorer, Firefox, or Safari. Enter http://192.168.0.1 into the address box, and press the Enter key.  The Login page appears.
   
   NOTE: By default the LAN IP address is 192.168.0.1.  If the default address has been changed, enter the custom address in the address box.
    
2. On the Login page:
   a.   Enter admin in the Username field.
   b.   Enter motorola in the Password field.
   c.   Click the Login button.  The Home page appears.
   
   NOTE: On firmware version 8.9.0.4 and later, the default admin password is required to be changed.  The Change User Password prompt will immediately appear after logging into the Web manager with the default admin password.  For assistance with the Change User Password screen, please refer to article # 18055 - SBG6580 (v.8.9.x): Prompt to Change Default Admin Login.
    
   
    
3. Move the mouse-cursor over Advanced, and select DMZ Host.  The Advanced - DMZ Host page appears.
4. On the Advanced - DMZ Host page:
   a.   DMZ Host - Enter 0.
   b.   Click the Apply button.
   
   
    

The DMZ Host feature in the SBG6580 has now been disabled.