AVG avg 9 internet security 用户手册
AVG 9 Internet Security © 2009 C opyright AVG Technologies C Z, s.r.o. All rights reserved.
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8.6. Firewall
Firewall is a system that enforces an access control policy between two or more
networks by blocking/permitting traffic. Firewall contains a set of rules that protect
the internal network from attacks originating outside (typically from the Internet) and
controls all communication on every single network port. The communication is
evaluated according to the defined rules, and then either allowed or forbidden. If
Firewall recognizes any intrusion attempts, it “blocks” the attempt and does not allow
the intruder access to the computer.
networks by blocking/permitting traffic. Firewall contains a set of rules that protect
the internal network from attacks originating outside (typically from the Internet) and
controls all communication on every single network port. The communication is
evaluated according to the defined rules, and then either allowed or forbidden. If
Firewall recognizes any intrusion attempts, it “blocks” the attempt and does not allow
the intruder access to the computer.
Firewall is configured to allow or deny internal/external communication (both ways, in
or out) through defined ports, and for defined software applications. For example, the
firewall could be configured to only permit web data to flow in and out using Microsoft
Explorer. Any attempt to transmit web data by any other browser would be blocked.
or out) through defined ports, and for defined software applications. For example, the
firewall could be configured to only permit web data to flow in and out using Microsoft
Explorer. Any attempt to transmit web data by any other browser would be blocked.
Firewall protects your personally-identifiable information from being sent from your
computer without your permission. It controls how your computer exchanges data with
other computers on the Internet or local network. Within an organization, the firewall
also protects the single computer from attacks initiated by internal users on other
computers in the network.
computer without your permission. It controls how your computer exchanges data with
other computers on the Internet or local network. Within an organization, the firewall
also protects the single computer from attacks initiated by internal users on other
computers in the network.
Recommendation: Generally it is not recommended to use more than one firewall on
an individual computer. The security of the computer is not enhanced if you install
more firewalls. It is more probable that some conflicts between these two
applications will occur. Therefore we recommend that you use only one firewall on
your computer and deactivate all others, thus eliminating the risk of possible conflict
and any problems related to this.
an individual computer. The security of the computer is not enhanced if you install
more firewalls. It is more probable that some conflicts between these two
applications will occur. Therefore we recommend that you use only one firewall on
your computer and deactivate all others, thus eliminating the risk of possible conflict
and any problems related to this.
8.6.1. Firewall Principles
In AVG, the Firewall component controls all traffic on every network port of your
computer. Based on the defined rules, the Firewall evaluates applications that are
either running on your computer (and want to connect to the Internet/local network),
or applications that approach your computer from outside trying to connect to your
PC. For each of these applications the Firewall then either allows or forbids the
communication on the network ports. By default, if the application is unknown (i.e. has
no defined Firewall rules), the Firewall will ask you if you wish to allow or block the
communication attempt.
computer. Based on the defined rules, the Firewall evaluates applications that are
either running on your computer (and want to connect to the Internet/local network),
or applications that approach your computer from outside trying to connect to your
PC. For each of these applications the Firewall then either allows or forbids the
communication on the network ports. By default, if the application is unknown (i.e. has
no defined Firewall rules), the Firewall will ask you if you wish to allow or block the
communication attempt.
Note: AVG Firewall is not intended for server platforms!