Chapter 13 Firewall
NBG-417N User’s Guide 137
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.
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.
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.