ZyXEL nbg-4615 用户指南

Chapter 23 Firewall

NBG4615 User’s Guide

Use this screen to enable or disable the NBG4615’s firewall, and set up firewall 
logs. Click Security > Firewall to open the General screen.

Figure 113   Security > Firewall > General l

The following table describes the labels in this screen.

If an outside user attempts to probe an unsupported port on your NBG4615, an 
ICMP response packet is automatically returned. This allows the outside user to 
know the NBG4615 exists. Use this screen to prevent the ICMP response packet 
from being sent. This keeps outsiders from discovering your NBG4615 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 71   Security > Firewall > General 

Enable Firewall

Select this check box to activate the firewall. The NBG4615 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.