ZyXEL nbg-334w Guia Do Utilizador
Chapter 12 Firewall
NBG334W User’s Guide
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12.4 Services Screen
Click Security > Firewall > Services. The screen appears as shown next.
If an outside user attempts to probe an unsupported port on your NBG334W, an ICMP
response packet is automatically returned. This allows the outside user to know the NBG334W
exists. Use this screen to prevent the ICMP response packet from being sent. This keeps
outsiders from discovering your NBG334W 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.
If an outside user attempts to probe an unsupported port on your NBG334W, an ICMP
response packet is automatically returned. This allows the outside user to know the NBG334W
exists. Use this screen to prevent the ICMP response packet from being sent. This keeps
outsiders from discovering your NBG334W 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.
Log
Select whether to create a log for packets that are traveling in the selected
direction when the packets are blocked or forwarded.
To log packets related to firewall rules, make sure that Access Control under Log
To log packets related to firewall rules, make sure that Access Control under Log
is selected in the Logs > Log Settings screen.
Apply
Click Apply to save the settings.
Reset
Click Reset to start configuring this screen again.
Table 50 Security > Firewall > General
LABEL
DESCRIPTION