Chapter 17 Firewall
EMG6765-Q10A User’s Guide
129
4
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.
5
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.
6
Protect against IP spoofing by making sure the firewall is active.
7
Keep the firewall in a secured (locked) room.
17.2 General Screen
Use this screen to enable or disable the EMG6765-Q10A’s firewall, and set up firewall logs. Click
Security
>
Firewall
to open the
General
screen.
Figure 74
Security > Firewall > General l
The following table describes the labels in this screen.
17.3 Services Screen
If an outside user attempts to probe an unsupported port on your EMG6765-Q10A, an ICMP response
packet is automatically returned. This allows the outside user to know the EMG6765-Q10A exists. Use this
screen to prevent the ICMP response packet from being sent. This keeps outsiders from discovering your
EMG6765-Q10A 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.
Click
Security
>
Firewall
>
Services
. The screen appears as shown next.
Table 55 Security > Firewall > General
LABEL
DESCRIPTION
Enable Firewall
Select this check box to activate the firewall. The EMG6765-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.
