How to setup HTTP Filtering to prevent Denial-of-Service Attacks on the

OfficeConnect Remote 812 Router

By default, the OCR 812 Web Configuration interface is accessed from the LAN interface as well as the WAN interface.

The following procedure describes how to configure a filter that prohibits access to the built-in HTTP server and the

Web Configuration interface from the WAN interface.

This filter will prevent all access to TCP and UDP port 80 from the WAN interface to the OCR 812. The Web

Configurator, however, will still be available to users on the local LAN interface for managing the unit.

Step 1:

Figure 2

Step 2:

Click on Configuration to enter the Configuration Screen.(Figure 3) At the bottom of the Configuration Screen is the

Filter Configuration section. Click on Setup Filters to enter the Setup procedure.(Figure 4)

Step 3:

To create a filter to block access for all remote sites, select the “From all Remote Sites” checkbox and click Next. On the

next screen click Create Filter. you will be presented with the Filter Protocol screen in Figure 5.

Figure 3

Figure 4

Step 4:

Give your filter a meaningful name that identifies what the filter is doing (Figure 5). You also need to select “Advanced

IP” in the Filter type options. Click Next.

Step 5:

Step 6:

The following screen is the Summary screen with both Filter Rules in place. Your screen should look very similar to

Figure 7. Click on Save Filter.

Step 7: