ZyXEL Communications VSG1432 Betriebsanweisung Seite 215

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VSG1432-B101 Series User’s Guide
215
CHAPTER 16
Firewall
16.1 Overview
This chapter shows you how to enable and configure the ZyXEL Device firewall.
Use the firewall to protect 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 91 Default Firewall Action
16.1.1 What You Can Do in this Chapter
•Use the Firewall screen to configure the security level of the firewall on the
ZyXEL Device (Section 16.2 on page 217).
•Use the Protocol screen to add or remove predefined Internet services and
configure firewall rules (Section 16.3 on page 217).
•Use the Access Control screen to view and configure incoming/outgoing
filtering rules (Section 16.4 on page 220).
WAN
LAN
3
4
1
2
A
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