User's Manual

EMG2926-Q10A User’s Guide
134
CHAPTER 17
Firewall
17.1 Overview
Use these screens to enable and configure the firewall that protects your EMG2926-Q10A and your
LAN from unwanted or malicious traffic.
Enable the firewall to protect your LAN computers from attacks by hackers on the Internet and
control access between the LAN and WAN. By default the firewall:
• allows traffic that originates from your LAN computers to go to all of the networks.
• blocks traffic that originates on the other networks from going to the LAN.
The following figure illustrates the default firewall action. User A can initiate an IM (Instant
Messaging) session from the LAN to the WAN (1). Return traffic for this session is also allowed (2).
However other traffic initiated from the WAN is blocked (3 and 4).
Figure 91 Default Firewall Action
17.1.1 What You Can Do
•Use the Ge n e r a l screen to enable or disable the EMG2926-Q10A’s firewall (
Section 17.2 on page
136
).
•Use the Service s screen to enable service blocking, enter/delete/modify the services you want
to block and the date/time you want to block them (Section 17.3 on page 136).
17.1.2 What You Need To Know
The following terms and concepts may help as you read through this chapter.
WAN
LAN
3
4
1
2
A