Operation Manual

Chapter 19 Firewall
NBG6515 User’s Guide
129
19.5 MAC 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 > MAC Filtering Rule. The screen appears as shown next.
Figure 98 Security > Firewall > MAC Filtering Rule
ICMP Internet Control Message Protocol is a message control and error-reporting protocol
between a host server and a gateway to the Internet. ICMP uses Internet Protocol (IP)
datagrams, but the messages are processed by the TCP/IP software and directly apparent to
the application user.
Enable ICMP
(WAN Ping)
Select this check box to activate the ICMP. The NBG will respond to WAN incoming Ping
requests.
Apply Click Apply to save the settings.
Reset Click Reset to start configuring this screen again.
Table 63 Security > Firewall > General
LABEL DESCRIPTION