Chapter 17 Firewall
NBG6616 User’s Guide
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Figure 87 Security > Firewall > General l
The following table describes the labels in this screen.
17.3 Services Screen
If an outside user attempts to probe an unsupported port on your NBG6616, an ICMP response
packet is automatically returned. This allows the outside user to know the NBG6616 exists. Use this
screen to prevent the ICMP response packet from being sent. This keeps outsiders from discovering
your NBG6616 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 > Services. The screen appears as shown next.
Table 56 Security > Firewall > General
LABEL DESCRIPTION
Enable Firewall Select this check box to activate the firewall. The NBG6616 performs access control and
protects against Denial of Service (DoS) attacks when the firewall is activated.
Apply Click Apply to save the settings.
Cancel Click Cancel to start configuring this screen again.
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