Operation Manual

Chapter 19 Firewall
NBG6515 User’s Guide
130
The following table describes the labels in this screen.
See Appendix E on page 232 for commonly used services and port numbers.
19.6 IP Filtering Rule Screen
If an outside user attempts to probe an unsupported port on your NBG, an ICMP response packet is
automatically returned. This allows the outside user to know the NBG exists. Use this screen to
prevent the ICMP response packet from being sent. This keeps outsiders from discovering your NBG
when unsupported ports are probed.
You can also use this screen to enable service blocking, enter/delete/modify the services you want
to block and the date/time you want to block them.
Click Security > Firewall > IP Filtering Rule. The screen appears as shown next.
Table 64 Security > Firewall > MAC Filtering Rule
LABEL DESCRIPTION
MAC Filtering Rule
Enable MAC
Filtering
Select this check box to enable MAC address filtering.
Define the filter action for the list of MAC addresses in the MAC Filtering Table.
Select Allow to permit access to the NBG, MAC addresses not listed will be denied access to
the NBG.
Select Deny to block access to the NBG, MAC addresses not listed will be allowed to access
the NBG.
MAC Filtering Table
Client PC MAC
Address
Enter the MAC address of the computer for which the MAC filtering rule applies.
Comment Enter a name that identifies or describes the firewall rule.
Add Click this to add the MAC filtering rule.
MAC Filtering Table
NO. This is the number of an individual MAC filtering rule.
Client PC MAC
Address
This field displays the MAC address of the computer.
Comment This field displays the descriptions of the MAC filtering rule.
Select Select the MAC filtering rule which you want to delete.
Delete Selected Click the Delete Selected button to remove the MAC filtering rule which selected from the
MAC Filtering Table. A window displays asking you to confirm that you want to delete the
rule.
Delete All Click the Delete All button to remove all MAC filtering rules from the NBG. A window
displays asking you to confirm that you want to delete all rules.
Apply Click Apply to save your changes back to the NBG.
Reset Click Reset to start configuring this screen again.