3Com 3CRWE52196 manual Gateway Configuration

66CHAPTER 5: GATEWAY CONFIGURATION

In addition to the four authorised services listed, you can choose to allow or block access to other services. You can either:

■Allow all other services with exceptions, or

■Block all other services with exceptions

4To do this, select Allow or Block from the drop down menu and enter the exceptions into the text box.

The port numbers are specified using a comma-separated list, with hyphens to denote port number ranges. So for example, entering 2, 3, 5-7would cause ports 2, 3, 5, 6, and 7 to be activated.

For example, to block access to all services except Web (80) and a service that uses ports 2,3,5,6 and 7:

1.Tick the Web(80) check box.

2.Select ‘Block’ all other services.

3.Enter ‘2, 3, 5-7’ in the ‘except (specify ports) box. See Figure 54.

Figure 54 PC Privileges Setup Screen Example

5Click Modify to save the settings or Close to discard them. To assign different access rights for different computers:

1If not already selected, click PCs access authorized services only.

2Click New to display the PC Privileges setting screen.

3Enter the last digit(s) of the IP address of the computer in the PC’s IP Address text box.