ARRIS Consumer Care

SBG8300: DMZ Setup

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Information

Question

How do I configure the DMZ Host in my SBG8300 gateway?

Answer

The DMZ Host feature allows the option to run a publicly accessible server within the home network. This enables the SBG8300 to forward all traffic to the designated DMZ Host device such as Web Server, Mail Server, Digital Video Recorder (DVR) or gaming device. That designated DMZ Host device will operate outside of the SBG8300 firewall and allow remote access from the Internet and not the home network. This document describes how to gather the client IP address and setup DMZ Host in the SBG8300.

CAUTION: The designated DMZ Host device is not protected by the SBG8300 firewall. It is exposed to the Internet and thus vulnerable to attacks or hacking from any computer on the Internet. Consider carefully before configuring a device to be in the DMZ. It is recommended to enable software firewall on that device or use a more secure method of forwarding traffic such as Port Forwarding. Please refer to Article #17972 - SBG8300: Port Forwarding Setup.

The following are examples of 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 device in the network.
When an application does not work well with port triggering or port forwarding.

After completing the DMZ Host setup, it is recommended to reserve the IP address for the client device setup for port forwarding. Please refer to Article #17970 - SBG8300: IP Address Reserve Setup.

Requirement
The client device IP Address is required to setup DMZ Host. It can be found in the SBG8300 Web Manager or from the client device's network information.

DMZ Host Setup

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 https:// Redirect page will appear.
The SURFboard Web Manager is begin redirected to a more secure connection, click the Proceed button to continue. The Gateway > Login page will appear.
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 by-pass the alert screen, refer to article # 18181 - Alert Message for Web Manager Access.

NOTE: The Home Network Wizard will appear if this is the first time accessing the Web Manager. For assistance with the wizard, refer to article # 17969 - SBG8300: Web Manager First Time Login.
Enter admin in the Username field and enter the custom password in the Password field.

NOTE: If the Login page prompts for email address and password. Log into the Web Manager with the email and password used when setting up the SURFboard Manager app with the SBG8300.
Click the Login button. The Gateway > Summary page will appear.
On the left hand-menu, click the Connected Devices link. The Connected Devices > Devices page will appear.
Under the IPv4 Address section, copy the client's IP Address to use for the DMZ Setup.

NOTE: If the client is not found it may not be powered on or not connected to the network.
On the left hand-menu, click the Advanced link and then click the DMZ sub-menu link. The Advanced > DMZ page will appear.
Click the Enable button. The DMZ v4 Host fields become active. The DMZ is disabled by default.
Click the Save button. Changes take effect immediately and a restart is not required.

NOTE: To disable DMZ Host, click the Disable button for the DMZ option and click the Save button.