3Com OfficeConnect 3C857, User Manual

Page: 66 / 120

66 C
HAPTER
5: G
ATEWAY
C
ONFIGURATION
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
4 To 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,
5-7 would 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
5 Click Modify to save the settings or Close to discard them.
To assign different access rights for different computers:
1 If not already selected, click PCs access authorized services only .
2 Click New to display the PC Privileges setting screen.
3 Enter the last digit(s) of the IP address of the computer in the PC’s IP
Address text box.