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and Information security>>Firewall Protection Firewall
Protection
Firewalls are used to protect
an organization's internal network from those on the outside
(internet). It limits and regulates the access from the
outside to the internal network and also regulates traffic
going out. It is used to keep outsiders from gaining
information to secrets or from doing damage to internal
computer systems. Firewalls are also used to limit the access
of individuals on the internal network to services on the
internet along with keeping track of what is done through the
firewall.
Firewalls filter traffic
based on their protocol, sending or receiving port, sending or
receiving IP address, or the value of some status bits in the
packet. There are several types of firewalls which include
packet filtering, circuit level relay, and application proxy.
If your organization
does not have a firewall, get one. At least implement
a packet filtering firewall on a Linux based computer,
if money is the concern.
- The firewall
should filter e-mail, FTP file transfers, and web
content traffic for potential harmful or hostile
code and viruses.
- No computer should
be directly connected to the internet without
going through an IS approved firewall. This means
independent modem connections to the internet
should be forbidden.
Firewall
Policy
- Set up a
"spoofing filter" on your firewall -
Don't allow traffic from the internet that
indicates a source IP address matching any of your
internal network addresses. This keeps attackers
from "spoofing" your machines and
possibly causing them to crash.
- Prevent spoofing
from your network - Place an outbound filter (for
addresses inside your network attempting outside
access) on the firewall that only allows traffic
from valid internal network addresses to be
serviced. This should prevent attacks against
other networks from being originated in your
network.
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Related Topics on Computer and
Information security
- Software
Vulnerability Control
- Firewall Protection
- Network
Intrusion Detection
- Network Port
Scanning
- Network Tools
passwords
- Types of attacks
- Application
Level Protection
- Systems Protection
- Mail and Security
- Hostile Software
For more topics and tutorials visit -
http://www.comptechdoc.org
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