ZyXEL Communications AMG1202-T series, User Manual, Page: 185 / 320

Chapter 15 Firewall
AMG1302/AMG1202-TSeries User’s Guide
185
15.5.1.1 Threshold Values
If everything is working properly, you probably do not need to change the threshold settings as the
default threshold values should work for most small offices. Tune these parameters when you
believe the AMG1302/AMG1202-TSeries has been receiving DoS attacks that are not recorded in
the logs or the logs show that the AMG1302/AMG1202-TSeries is classifying normal traffic as DoS
attacks. Factors influencing choices for threshold values are:
1
The maximum number of opened sessions.
2
The minimum capacity of server backlog in your LAN network.
3
The CPU power of servers in your LAN network.
4
Network bandwidth.
5
Type of traffic for certain servers.
Reduce the threshold values if your network is slower than average for any of these factors
(especially if you have servers that are slow or handle many tasks and are often busy).
• If you often use P2P applications such as file sharing with eMule or eDonkey, it’s recommended
that you increase the threshold values since lots of sessions will be established during a small
period of time and the AMG1302/AMG1202-TSeries may classify them as DoS attacks.
15.5.2 Configuring Firewall Thresholds
Click Security > Firewall > DoS > Advanced to display the following screen.
Figure 89
Security > Firewall > DoS > Advanced