When you use internet in your college/school/offfice , You may not
be access some websites, right? Do you know how they block those
websites? They use firewalls for block websites. Firewall prevent the
system from hackers attack. Lets us what is firewall.
What is Firewall?
Firewall is working like a security guard standing outside the office. Usually, What the
security guard do? He will allow those who has identity card and block
those who has not the identity card. Right? Likewise, The firewall will
block unauthorized access to the system. Firewall may be a software
or hardware. It will work based on the set of rules defined by the
administrator. Using Firewall administrator can block certain website
from being accessed.
-All traffic from inside and outside of the network must pass through the firewall.
-Only authorized trafic will be allowed to pass (based on the set of rules)
Types of Fire Walls
-Packet Filtering -Appliction level gate way -Circuit level gate way.
Packet Filtering (Network Layer)
A packet filtering router applies a set of rules to each incoming IP
packet and then forwards or discards the packets. Router is configured
such that it can filter incoming and outgoing packets. The packets will
filtered based on the source and destination IP address. IP spoofing
attack is possible in this packet filtering. IP spoofing can be
achieved by changing the source IP address of packets. Stateful Inspection Firewalls
A stateful inspection packet filters tightens the rules of TCP traffic
by creating a state table of out bound TCP connection. If the packet
matches with existing connection based on the state table, it will be
allowed. If it does not match, It will be evaluted according to the rule
set for new connections.
Aplictaion Level Gateway
Application level gateway is also known as proxy server. The user
communicate with the gateway using application layer of TCP/IP stack.
The gateway asks the user for the name of the remote host to be
connected. When the user enters valid user ID, gateway will give access
to the remote application. This will block the malicious activity and
correct the application behavior. This will ensure the safety of
company. More secure than packet filtering. Easy to log and audit
all incoming traffic at the application level. Application-level
filtering may include protection against spam and viruses as well, and
be able to block undesirable Web sites based on content rather than just
their IP address
Circuit Level Gateway
The circuit
level gateway works at session layer of OSI model. Monitor TCP
handshaking between packets to make sure a session is legitimate.
Traffic is filtered based on the session rules. Circuit-level firewalls
hide the network itself from the outside, which is useful for denying
access to intruders. But they don't filter individual packets. This
firewall is used when the administrator trusts internal users.
Why Firewall?
Firewall block unauthorized users, prohibits vulnerable services from entering or leaving the network. Protection from IP spoofing and routing attacks. Protection against Remote login, Trojan backdoors, Session hijacking, cookie stealing,etc.
Limitation of Firewalls
The fiewall cannot protect against attacks that by pass the firewall. The firewall does not protect against internal threats
The firewall cannot protect against the transfer of virus infected
progams (or) files. It would be impossible for the firewall to scan all
incoming files, emails for viruses.
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