![background image](http://html1.mh-extra.com/html/zyxel-communications/p-660r-f1-series/p-660r-f1-series_user-manual_945302085.webp)
P-660R-F1 Series User’s Guide
85
C
HAPTER
7
Firewalls
7.1 Overview
This chapter shows you how to enable and configure the ZyXEL Device firewall. Use these screens
to enable and configure the firewall that protects your ZyXEL Device and network from attacks by
hackers on the Internet and control access to it. By default 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.
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 48
Default Firewall Action
7.1.1 What You Can Do in the Firewall Screens
• Use the
General
screen to enable firewall and/or triangle route on the ZyXEL Device, and set the
default action that the firewall takes on packets that do not match any of the firewall rules.
• Use the
Rules
screen to view the configured firewall rules and add, edit or remove a firewall rule.
• Use the
Threshold
screen to set the thresholds that the ZyXEL Device uses to determine when
to start dropping sessions that do not become fully established (half-open sessions).
7.1.2 What You Need to Know About Firewall
DoS
Denials of Service (DoS) attacks are aimed at devices and networks with a connection to the
Internet. Their goal is not to steal information, but to disable a device or network so users no longer
WAN
LAN
3
4
1
2
A
Summary of Contents for P-660R-F1 series
Page 2: ......
Page 8: ...Certifications P 660R F1 Series User s Guide 8 ...
Page 16: ...P 660R F1 Series User s Guide 16 ...
Page 18: ...P 660R F1 Series User s Guide 18 ...
Page 62: ...Chapter 4 WAN Setup P 660R F1 Series User s Guide 62 ...
Page 104: ...Chapter 7 Firewalls P 660R F1 Series User s Guide 104 ...
Page 140: ...Chapter 9 Certificates P 660R F1 Series User s Guide 140 ...
Page 144: ...Chapter 10 Static Route P 660R F1 Series User s Guide 144 ...
Page 162: ...Chapter 12 Dynamic DNS Setup P 660R F1 Series User s Guide 162 ...
Page 190: ...Chapter 15 System P 660R F1 Series User s Guide 190 ...
Page 204: ...Chapter 16 Logs P 660R F1 Series User s Guide 204 ...
Page 212: ...Chapter 18 Diagnostic P 660R F1 Series User s Guide 212 ...
Page 216: ...Chapter 19 Troubleshooting P 660R F1 Series User s Guide 216 ...
Page 220: ...P 660R F1 Series User s Guide 220 ...
Page 222: ...P 660R F1 Series User s Guide 222 ...
Page 246: ...P 660R F1 Series User s Guide 246 ...
Page 250: ...P 660R F1 Series User s Guide 250 ...
Page 258: ...P 660R F1 Series User s Guide 258 3 Click OK to close the window Figure 172 Java Sun ...
Page 266: ...P 660R F1 Series User s Guide 266 ...
Page 267: ...P 660R F1 Series User s Guide 267 ...
Page 268: ...P 660R F1 Series User s Guide 268 ...