A firewall is a security apparatus which
prevents unauthorized users from accessing
a computer network and monitors transmission
of information into and out of a network.
It is the most essential tool to curb
viruses and worms, and it clamps down
on the amount of unwanted spam received
by the network's clients. Service
providers generally offer the 'Stateful
Inspection' mode and sometimes
also add the 'Deep Inspection' mode
to the firewall. Traditionally, firewall
systems and basic anti-virus software
used to provide adequate coverage for
networks from curious and unwanted visitors.
However, the increasing knowledge and
innovative technology of modern hackers
allows them to penetrate even the most
resolute firewalls. Thus, security issues
need a more holistic approach, and firewalls
need to be supplemented with an additional
layer of security such as ‘Intrusion
Detection’. This will facilitate
the process of screening internet traffic
detection. As soon as the firewall detects
whether traffic can gain access to a
computer, the 'Intrusion Detection
System' will thoroughly check it
to examine and identify any suspicious
attack pattern. If an attack pattern
is detected as suspicious, then the traffic
is automatically and immediately terminated.
Thus 'Stateful' or 'Deep
Inspection' firewall systems supported
by IDS can satisfactorily prevent hackers
from transporting spam or viruses to
the network client’s machines.
A layered security approach enables administrators
to protect the communications and resources
at the perimeter and infrastructure,
as well as extended to remote sites and
users.
The network security services companies
offer customized security solutions according
to the specific needs of their clientele.
Integrated Firewall/IPSec VPN appliances
and systems incorporated with anti-virus
features ensure that there are no weak
links in the network. A ‘Stateful’ system
empowers the administrators to effectively
control the accessibility of the network
and also authenticates identities as given
by the surfers to minimize unauthorized
roaming and keep hackers at bay. Firewalls
collect information on various details
in a packet header— source and destination
IP addresses, source and destination port
numbers, packet sequence numbers, etc.
The device then continuously monitors the
state and position of each TCP session
or UDP pseudo-session navigating the firewall,
performing TCP reassembly as and when necessary,
thus ensuring accurate interpretation of
the communication session. As soon as a
responding packet arrives, the firewall
readily compares the information reported
in its header with the corresponding state
of its associated session stored in the
inspection table. If they are identical,
then the responding packet is allowed to
pass the firewall. If the packet does not
match, then it is immediately stopped in
its tracks.
The ‘Deep Inspection’ firewall
adds muscle to the'‘Stateful Inspection'
and integrates intrusion prevention technology
into a system to prepare application-level
attack protective shields at the perimeter
of a network. Leveraging the efficiencies
of both technologies, the Inspection firewall
can competently perform network security
functions as well as analyze the application
message to determine the right to passage
of the traffic. Deployed at the perimeter,
a Deep Inspection firewall concentrates
on averting application-level attacks aimed
at Internet-facing applications, such as
Web, e-mail, FTP and DNS.
Firewalls also introduce network segmentation
to contain attacks in the clients’ infrastructure.
The machines of the clients withstand the
system overloads with the help from strong
and reliable ‘Denial-of-service’/‘DoS’ protection
service of the security provider. Apart
from the mentioned ‘DoS’ attacks,
a quality firewall system must also shield
the network client from application-level
attacks and secure wireless LANs, consolidate
firewall deployments to maintain a consistent
performance. The IPSec VPN system allows
companies to establish secure connections
between management, business partners,
employees and customers, thus in a nutshell
providing an end-to-end blanket security
solution. The dynamic and secure VPN combines
the efficiency and resilience of the route-based
VPN with the security and the flexibility
of a policy based customized firewall.
The Integrated Firewall/VPN system can
be managed by using the following - Command
Line Interface (CLI), a web based graphical
user interface or through a centralized
management console, which simplifies configuration,
deployment and continuous management. The
above-mentioned services are available
at almost all quality network security
providers but firewalls can be seriously
detrimental to Internet Video Communications.
It can involuntarily block video sessions
resulting in frustration as well as on
possible sources of revenue because of
lost business opportunities. ACES has the
technology to provide seamless video delivery
between different combinations of firewalls
and modems. The Firewall/VPN and IPSec
services of ACES has been certified by
the ICRA for conforming to its common criteria,
ensuring world class and absolutely safe
standards.
So if you are experiencing a deluge of
spam and afflicted regularly by stubborn
viruses intent on wrecking your machine,
then click here to put an end to your concerns.
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