FIREWALL CM Presentation

8/3/2019 FIREWALL CM Presentation

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FIREWALL

PRESENTED BY

AJEET KERKETTA(183)CHANDAN DUTTA(190)



What is a Firewall?

A firewall is hardware, software, or a combination

of both that is used to prevent unauthorizedprograms or Internet users from accessing a

private network and/or a single computer



Hardware vs. Software Firewalls

Hardware Firewalls

± Protect an entire network

±

Implemented on the router level ± Usually more expensive, harder to configure

Software Firewalls

± Protect a single computer

± Usually less expensive, easier to configure



How does a firewall work ?

Inspects each individual packet of data as it

arrives at either side of the firewall

Inbound to or outbound from your computer Determines whether it should be allowed to

pass through or if it should be blocked



Firewall Rules

Allow traffic that flows automatically

because it has been deemed as safe (Ex.

Meeting Maker, Eudora, etc.)

Block traffic that is blocked because it has

been deemed dangerous to your computer

Ask asks the user whether or not the traffic

is allowed to pass through



Firewall approach

it provides numerousadvantages to sites byhelping to increase overallhost security

1. Protection from VulnerableServices

2. Controlled Access to SiteSystems

3. Concentrated Security4. Enhanced Privacy

5. Logging and Statistics onNetwork Use, Misuse



Protection from Vulnerable Services

improve network securityand reduce risks to hosts onthe subnet

prohibit certain vulnerable

services such as NFS fromentering or leaving aprotected subnet

permits the use of theseservices with greatly

reduced risk to exploitation protection from routing-

based attacks



Controlled Access to Site Systems

Ability to control accessto site systems.

Do not provide access to

hosts or services that donot require access

A user requires little orno network access to

desktop workstation,then a firewall canenforce this policy



Concentrated Security

most modified additionalsecurity software couldbe located on the firewallsystems as opposed to

being distributed onmany hosts.

opposed to each systemthat needed to beaccessed from the

Internet. simpler to implement to

run specialized software.



Enhanced Privacy

Normally be consideredinnocuous information thatwould be useful to anattacker.

Some sites wish to blockservices such as finger andDomain Name Service.

Firewall used to block DNSinformation about site

systems. The names and IP addresses

systems would not beavailable to Internet hosts.



Logging and Statistics on Network Use,

Misuse

firewall can logaccesses and providevaluable statistics

about network usage with appropriate

alarms that soundwhen firewall andnetwork are beingprobed or attacked



Types of firewalls

1.packet filtering

firewalls

2.circuitlevel gateways3.application gateways

4.stateful multilayer

inspection firewall



Advantages of firewall Concentration of security

Protocol filtering

Information hiding

Application gateways ,

Extended logging

Centralized and simplifiednetwork services management



Disadvantages of firewall

Certain types of networkaccess may be hampered forsome hosts, telnet, ftp, XWindows, NFS, NIS, etc

A firewall system is that itconcentrates security in onespot as opposed to distributingit among system.

A firewall cant protect against

attacks that dont go throughthe firewall.

Firewalls can't protect wellagainst things like viruses.



Conclusion

In conclusion inter net isthe dangerous place..

Without firewall not

connected to inter net. Fire wall protect private

file from outsiders.

Firewall providenecessary security forsuch type of illegalaccess.



THANK YOU!

FIREWALL CM Presentation

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