ZyXEL Communications NBG4115 用户手册
Chapter 13 Firewall
User’s Guide
144
13.2 General
Use this screen to enable or disable the NBG4115’s firewall, and set up firewall
logs. Click Security > Firewall to open the General screen.
logs. Click Security > Firewall to open the General screen.
Figure 74 Security > Firewall > General l
The following table describes the labels in this screen.
13.3 Services
If an outside user attempts to probe an unsupported port on your NBG4115, an
ICMP response packet is automatically returned. This allows the outside user to
know the NBG4115 exists. Use this screen to prevent the ICMP response packet
from being sent. This keeps outsiders from discovering your NBG4115 when
unsupported ports are probed.
ICMP response packet is automatically returned. This allows the outside user to
know the NBG4115 exists. Use this screen to prevent the ICMP response packet
from being sent. This keeps outsiders from discovering your NBG4115 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.
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 NBG4115 performs
access control and protects against Denial of Service (DoS) attacks
when the firewall is activated.
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.