All You need to know About Firewall

1
All You Need to Know About Firewall
2
Firewall N/W Security

• A firewall can be described as a network security
  system whose function is to control and monitor
  incoming and outgoing networks. A firewall is
  based on predetermined security rules. It acts as
  a barrier securing an inner network from an outer
  network, for instance, internet. Network firewall
  is a software appliance running on hardware based
  firewall used to filter traffic on more than two
  networks.
• A layer of software protection is provided by a
  host based firewall on one of the hosts that is
  responsible for network traffic. Routers are
  used to separate different broadcast domains and
  pass data between networks, these networks
  contain firewall components and also performs
  basic routing functions.

3
How do Firewalls Work

• Firewalls are set up at every Internet connection
  point. This helps the system in evaluating even
  the minutest of data which flows into it. These
  firewalls can be tuned to follow a specific set
  of rules, either specified by you or by the
  administrator, to allow traffic to their servers.

4
Characteristic of Firewall

• Direction control Helps  determine direction for
  the initiation of requests allowed to flow from
  Firewalls.
• Service control To determine types of services
  that are accessible, such as outbound and
  inbound. Traffic can be filtered on the basis of
  protocol, port number, proxy servers and IP
  addresses.
• Behavior control It controls some particular
  services. A portion of the information provided
  on a local web server may be externally
  accessible.
• User Control It can be applied for incoming
  traffic from external users and requires some
  form of authentication such as provided by IPsec.

5
OSI Vs TCP/IP Networks Model

• To understand the working of a firewall, we must
  know how different networking layers interact in
  the flow. Each layer has a set of
  responsibilities and is handled in a well-defined
  manner. The OSI model is a newer version that has
  become a standard as TCP/IP does not meet several
  requirements and industry standards.
• The lowest level at which a Firewall works is
  layer three and it is defined as the network
  layer in OSI model whereas in TCP/IP it works as
  an Internet protocol layer. This layer is
  concerned with the destination of routing
  packets. At this level, it can be determined
  whether the source is trusted or not.

6
Need of Firewall Protection

• There is no doubt that internet has transformed
  the way the companies transacted their business
  years ago. Although enterprises are leveraging
  its use for day-to-day business transactions, but
  internet has some setback.
• Internet has made confidential data available to
  unscrupulous computer geeks who look out for such
  sensitive data either to trade or fulfil their
  other vested interests. Firewall works as a
  protective sheet between private enterprise
  networks and hackers, to prevent the theft of
  such confidential enterprise data.

7
Use of Next-generation firewalls (NGFW)

• Next Generation Firewalls came into the picture
  due to some limitations in Stateful Packet
  Inspection as it does not inspect network packets
  containing data payload and also due to high
  network traffic, it uses web protocols, including
  business and non-business applications. New
  approaches have been added by security vendors,
  including deep packet and inspection intrusion
  prevention, for the detection of malware in
  network traffic.
• This can be a drawback too as these approaches
  add more and more devices that add latency, as
  these packets are passed from one appliance to
  the other. These devices should be configured in
  some unified threat management systems so that
  multiple functions can be handled in a single
  platform. NGFW helps address application
  awareness drawbacks and traffic inspection,
  without hampering performance.

8
The Development of Firewall Types in Network
Security System

• Network security has been through a lot of
  changes and iterations in order to have evolved
  and provide better protection to users. . In this
  brief blog post, we provide you information about
  the different types of network firewall.
• Access Control Lists (ACLs) This type of
  firewall was used earlier and used for routers.
  It was fairly used for performance and
  scalability however a drawback of this firewall
  is it is unable to read anything more than packet
  headers. This provides only the undeveloped and
  fundamental information about the traffic.
• Proxy firewalls The firewall works on incoming
  network traffic by copying the anticipated
  recipient. Proxy firewalls inspect the network
  traffic and send details to the destination
  computers that is possible only when the access
  is permitted. The response of the computer
  response is then transferred to the proxy that
  sends the data across with the origin address of
  the proxy server. Through this process the proxy
  firewalls build a gap between two computers which
  implies that it is the only machine connected to
  the outside world.

9
The Development of Firewall Types in Network
Security System (Cont.)

• Stateful inspection firewalls An evolutionary
  step in the world of network firewall, it is
  effective in sorting and tracking the actual
  state of traffic. It tracks the state of traffic
  by examining all the connection interactions till
  the time a connection is suspended.
• Unified Threat Management (UTM) solutions These
  are the solutions that combine stateful
  examination firewalls, IPS and antivirus into a
  single machine by taking into account other
  network security capabilities.
• Next-generation firewalls (NGFWs) These
  firewalls were created to counteract the growing
  capability of appliances and malware. The NGFW
  brings together the major network protection
  functions, comprising of unconventional firewall,
  URL filtering, IPS/IDS and threat security. The
  NGFW solutions ensure improved security as
  compared to the legacy firewalls, point threat
  finding products, or UTMs. These functions are
  designed into the product from the beginning and
  share important information across various
  disciplines.

10
Benefits of Firewall

• Prevent attacks on your private network by the
  other networks outside the world.
• It allows you to define a funnel, keeping aside
  the non-authorized users.
• Allow monitoring the security of your network and
  computer when suspicious activity occurs, it will
  generate an alarm.
• Monitor and record services using WWW (World
  Wide Web), FTP (File Transfer Protocol) and other
  protocols.
• Control the use of Internet. It helps to block
  or un-block inappropriate or appropriate
  material.

11
Disadvantages of Firewall

• Legitimate User Restriction
• Diminished Performance
• Vulnerabilities
• Internal Attack
• Cost

12
Our Social Reach
13
Cyberoam Technologies
USA Central 1-732-412-4896Delhi NCR
91-9899150300 Ahmedabad 91-9925011328 Bangalo
re 91-9880345671 Dubai
971-4-214 9860
Cyberoam House, Saigulshan Complex, Opp.
Sanskruti, Beside White House, Panchwati Cross
Road, Ahmedabad - 380006, GUJARAT, INDIA.
North America 505 Thornall Street, Suite
304 Edison, NJ -08837 USA
sales_at_cyberoam.com http//www.cyberoam.com/
14
Thank You