ZyXEL Communications NBG-417N manual General Firewall Screen, Services Screen, 137

Chapter 13 Firewall

13.4 General Firewall Screen

Use this screen to enable or disable the NBG-417N’s firewall, and set up firewall logs. Click Security > Firewall to open the General screen.

Figure 76 Security > Firewall > General

The following table describes the labels in this screen.

Table 50 Security > Firewall > General

LABEL	DESCRIPTION
Enable Firewall	Select this check box to activate the firewall. The NBG-417N performs
	access control and protects against Denial of Service (DoS) attacks
	when the firewall is activated.
Apply	Click Apply to save the settings.
Reset	Click Reset to start configuring this screen again.

13.5 Services Screen

If an outside user attempts to probe an unsupported port on your NBG-417N, an ICMP response packet is automatically returned. This allows the outside user to know the NBG-417N exists. Use this screen to prevent the ICMP response packet from being sent. This keeps outsiders from discovering your NBG-417N 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.

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