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NBG7815 User’s Guide
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HA PTER
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Se c urity
12.1 O ve rvie w
Use these screens to enable and configure the firewall that protects your NBG7815 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
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).
Fig ure 71
Default Firewall Action
Note: Features in this chapter are not available if you are using bridge mode.
12.1.1 Wha t Yo u C a n Do
• Use the
IPv4 Fire wa ll
screen to enable or disable the NBG7815’s IPv4 firewall ( Section 12.2 on page
127 ).
• Use the
IPv6 Fire wa ll
screen to enable or disable the NBG7815’s IPv6 firewall ( Section 12.3 on page
130 ).
12.1.2 Wha t Yo u Ne e d To Kno w
The following terms and concepts may help as you read through this chapter.