Firewall; C Ha Pte R 19 Fire Wa Ll; Overview; What You Can Do - ZyXEL Communications NBG6515 User Manual

19.1 O ve rvie w
This chapter shows you how to enable and configure the firewall that protects your NBG 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
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).
Default Firewall Action
Fig ure 91
19.2 Wha t Yo u C a n Do
• Use the
G e ne ra l
• Use the
MAC Filte ring Rule
devices or block the devices from accessing the NBG.
• Use the
IP Filte ring Rule
devices or block the devices from accessing the NBG.
(Section 19.4 on page 124) screen to enable or disable the NBG's firewall.
screen (Section 19.5 on page
screen (Section 19.6 on page
NBG6515 User's Guide
123
C
HA PTER
Fire wa ll
can initiate an IM (Instant Messaging)
A
125) to configure the NBG to block access to
126) to configure the NBG to block access to
1 9