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AMG1312-T Series User’s Guide 168
CHAPTER 15
Firewall
15.1 Overview
This chapter shows you how to enable the AMG1312-T Series firewall. Use the firewall to protect
your AMG1312-T Series and network from attacks by hackers on the Internet and control access to
it. The firewall:
• allows traffic that originates from your LAN computers to go to all other networks.
• blocks traffic that originates on other networks from going to the LAN.
• blocks SYN and port scanner attacks.
By default, the AMG1312-T Series blocks DDOS, LAND and Ping of Death attacks whether the
firewall is enabled or disabled.
The following figure illustrates the 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 84 Default Firewall Action
15.1.1 What You Can Do in the Firewall Screens
•Use the General screen (Section 15.2 on page 170) to select the firewall protection level on the
AMG1312-T Series.
•Use the Default Action screen (Section 15.3 on page 171) to set the default action that the
firewall takes on packets that do not match any of the firewall rules.
•Use the Rules screen (Section 15.4 on page 173) to view the configured firewall rules and add,
edit or remove a firewall rule.
•Use the Dos screen (Section 15.5 on page 179) to set the thresholds that the AMG1312-T Series
uses to determine when to start dropping sessions that do not become fully established (half-
open sessions).
WAN
LAN
3
4
1
2
A