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A firewall imposes restrictions on incoming and outgoing packets to and from the private network. All the traffic, whether incoming or outgoing, must pass through the firewall, and only authorized traffic is allowed to pass through it.
The primary approach of using a Firewall
is to deal with numerous point regarding
security of your Server or Host.
•A Firewall imposes
restrictions on incoming and
outgoing packets to and from
the private network.
•All the traffic, whether
incoming or outgoing, must
pass through the firewall, and
only authorized traffic is
allowed to pass through it.
Some of the segments that covers
under these benefits are:
•A Firewall act as a barrier to control access over to a site
•This can be explained by the example that if some host
can be made reachable from outside networks, whereas
others can be effectively sealed off from unwanted
•A site could prevent outside access to its hosts except for
special cases such as mail servers or information servers.
•Thus providing a filtering system which enables only
those that meet the access policy.
•A Firewall remains the better choice for organizations
willing to cut costs on their security mechanism.
•Simply put, it becomes easier to set unique security
credentials on the Firewall itself, and it works on all
systems accessing the network.
•Firewall is also a better option because it requires less
installation and maintenance costs, unlike other solutions.
•Despite of the fact that Kerberos and other security
mechanisms have their added benefits over Firewall, the
letter one remains more popular due to its simplicity,
specialization and less costs.
•Privacy is one of the crucial factors that must be taken
care as innocuous information might contain clue that
termed to be very helpful to hackers or attackers.
•Since to overcome these factors and grab a much
effective security value, a Firewall comes in action.
•They help in blocking services that can be helped in leaking
this information such as finger and Domain Name Service.
•These Firewalls can also be used to block DNS information
about site systems, thus the names and IP addresses of site
systems would not be available to Internet hosts.
4. Shield from Network Misuse,
•A Firewall can be very beneficial if it was used as a filter
towards all of the internet access to and from the system
passes through it.
•The firewall can log accesses and provide valuable
statistics about network usage.
•It is very beneficial to collect network usage statistics and
evidence of probing for a number of reasons.
•One of the primary importance is knowing whether the
firewall is withstanding probes and attacks, and
determining whether the controls on the firewall are
adequate thus helping in maintaining risk factors.
•A Firewall can enhance network security and reduce
risks to hosts by filtering inherently insecure services.
•As a result, the subnet gets shield from all of the risks, as
only selected protocols will be able to pass through the
•A Firewall could block any vulnerable services such as
NFS from entering or leaving a subnet.
•A Firewall could reject all source-routed packets and
ICMP redirects and then inform administrators of the
A Linux Firewall acts as a shield for your system through
five different stages, from the time it's installed on your
computer to the appearance of the ransom warning on your