VMG1312-B Series User’s Guide 217
CHAPTER 15
Firewall
15.1 Overview
This chapt er shows you how t o enable and configure t he Device’s security sett ings. Use the firewall
to prot ect your Device and net work from att acks by hackers on the I nternet and control access t o
it. By default the firewall:
• allows t raffic t hat originates from your LAN com put ers t o go t o all other networks.
• blocks traffic that originates on ot her networks from going t o t he LAN.
The following figure illustrates the default firewall act ion. User A can initiat e an I M (I nst ant
Messaging) session from the LAN to the WAN ( 1). Ret urn traffic for t his session is also allowed ( 2).
However ot her t raffic init iat ed from t he WAN is blocked ( 3 and 4) .
Figure 99 Default Firewall Act ion
15.1.1 What You Can Do in this Chapter
• Use the Genera l screen to configure t he securit y level of t he firewall on t he Device (
Section 15.2
on page 219
) .
• Use the Service screen to add or rem ove predefined I nternet services and configur e firewall
rules ( Sect ion 15.3 on page 219).
• Use the Access Con t rol screen t o view and configure incom ing/ out going filt ering rules (
Sect ion
15.4 on page 221
) .
• Use the DoS screen t o act ivate prot ect ion against Denial of Service (DoS) att acks ( .
Section 15.5
on page 224
) .
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