ZyXEL Communications Corporation EMG2926Q10A Manuel D’Utilisation

Chapter 17 Firewall

EMG2926-Q10A User’s Guide

Limit who can access your router. 

Don't enable any local service (such as NTP) that you don't use. Any enabled service could present 
a potential security risk. A determined hacker might be able to find creative ways to misuse the 
enabled services to access the firewall or the network. 

For local services that are enabled, protect against misuse. Protect by configuring the services to 
communicate only with specific peers, and protect by configuring rules to block packets for the 
services at specific interfaces. 

Protect against IP spoofing by making sure the firewall is active. 

Keep the firewall in a secured (locked) room. 

Use this screen to enable or disable the EMG2926-Q10A’s firewall, and set up firewall logs. Click 
Security > Firewall to open the General screen.

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 EMG2926-Q10A, an ICMP 
response packet is automatically returned. This allows the outside user to know the EMG2926-Q10A 
exists. Use this screen to prevent the ICMP response packet from being sent. This keeps outsiders 
from discovering your EMG2926-Q10A when unsupported ports are probed.

You can also use this screen to

 enable service blocking, and enter/delete/modify the services you 

want to block and the date/time you want to block them

 

enable/add/delete/modify an IPv4 firewall 

rule

.

Security > Firewall > General 

Enable Firewall

Select this check box to activate the firewall. The EMG2926-Q10A 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.