introductionoffirewall-140514125107-phpapp01 (1).pptx
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Institute Of
Technology
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Introduction To
Firewall
Prepared by:-Shashank Kishan 1MS13IS100
Saurav Pandey 1MS13IS096
Vivek Yagnik 1MS13IS12
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Content
Defne what is frewall ?
Need o frewall
Types o frewall
Hardware frewall
Advantage and disadvantage Sotware frewall
Advantage and disadvantage
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Types o frewall techniques
Packet flter
Drawack o packet fltering
Application gateway
advantage
!ircuit"level gateway
#astion host
$hat a personal frewall can do
$hat a personal frewall can not do
%anuacturing co&panies
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Firewall
'irewall is device that provides secureconnectivity etweennetworks(internal)e*ternal+,
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A frewall &ay e a hardware- sotwareor a co&ination o oth that is used to
prevent unauthori.ed progra& orinternet users ro& accessing a privatenetwork or a single co&puter,
All &essage entering or leaving theintranet pass through the frewall-which e*a&ines each &essage /
locks those that do not &eet thespecifed security criteria,
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Why Need Firewall
To protect confdentialinor&ation ro& thosewho do not e*plicitlyneed to access it,
To protect our network/ its resources ro&
&alicious users /accidents that originateoutside o our network,
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Types Of Firewall
Hardware frewall
Sotware frewall
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Hardware Firewall
0t is a physical device,
0t can e installed
etween the &ode&and co&puter,
0t can e incorporatedinto a roadand routereing used to share theinternet connection,
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Protect an entire network,
1sually &ore e*pensive- harder toconfgure
2,g," !isco pi*- netscreen- watchuardetc,
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Hardware Firewall d!antages
1ses very little syste& resources,
%ore secure
2nhanced security control
Dedicated hardware frewalls are typically
&ore reliale
2asy to disale or re&ove
$ork independently o associated
co&puter syste&,
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Hardware Firewall "isad!antages
0nstall process is &ore de&anding othphysically and &entally,
Takes up physical work space,
%ore e*pensive,
Harder to upgrade and repair,
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Software Firewall
0t is a sotwareapplication,
0t is installed onto theco&puter syste& thatyou wish to protect ,
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Protect a single co&puter
This is usually the co&puter with&ode& attached to it,
1sually less e*pensive- easier toconfgure,
2,g," Norton internet security- %acAeeinternet security etc,
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Software Firewall d!antages
!onsideraly cheaper or even ree, Si&ple to install and upgrade,
3equires no physical changes to
hardware or network,
0deal or ho&e)a&ily use,
Takes up no physical space,
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Software Firewall "isad!antages
Sotware &ay crash or e inco&patile
with syste&,
!an e di4cult to co&pletely disale /
especially re&ove,
Sotware ugs &ay co&pro&ise security,
!an e resource hungry,
0nco&patiilities with 5S,
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Types Of FirewallTechni#ue
Packet flter
Application gateway)pro*y server)pro*y
application gateway
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$ac%et Filter
0t looks at each packet entering orleaving the network accepts or re6ectsit ased on user"defned rules,
pplications
$resentations
Sessions
Transport
"ata &in%
$hysical
"ata &in%
$hysical
Router
pplications
$resentations
Sessions
Transport
"ata &in%
$hysical
Networ%
Networ%
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Packet fltering is airly e7ective /transparent to users- ut it is di4cult to
confgure,
0n addition- it is susceptile to 0P
spoofng,
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Drawacks 5 Packet 'iltering Technique
Packet fltering rules can e co&ple*,
8ogging acility is not provided y suchfrewall,
0 T!P)0P packet fltering is noti&ple&ented ully- it can lead to
security hole, !annot handle 3P! (re&ote produce
calls+,
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pplication 'ateway($ro)ySer!er($ro)y pplication 'ateway
0n such type o frewall re&ote host ornetwork can interact only with pro*y
server- pro*y server is responsile orhiding the details o the internalnetwork i,e, intranet,
1sers uses T!P)0P application- such as'TP / Telnet servers,
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pplications
$resentations
Sessions
Transport
"ata &in%
$hysical
Networ%
"ata &in%
$hysical
pplications
$resentations
Sessions
Transport
"ata &in%
$hysical
Application Gateway
pplications
$resentations
Sessions
Transport
Networ% Networ%
TelnetTelnet HTT$HTT$FT$FT$
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This is very e7ective- ut can i&pose aperor&ance degradation,
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Advantages 5 Application 9ateway
8ess co&ple* flter rules
!ost e7ectiveness
3oust authentication / logging acility
Pro*y authenticates only thoseservices or
$hich it is confgured)installed,
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What $ersonal Firewall Can "o
Stop hackers ro& accessing yourco&puter,
Protect your personal inor&ation,
#locks :pop up; ads and certaincookies,
Deter&ines which progra&s canaccess the internet,
#lock invalid packets,
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What $ersonal Firewall Cannot"o
!annot prevent e"&ailviruses
"only an antivirus product
with update defnitions
can prevent e"&ail viruses,
Ater setting it initially-
you cannot orget aout it"The frewall will require
periodic updates to the rule sets and thesotware itsel,
Deadly
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Manufacturingcompanies
!isco syste&- 0nc,
Nortel networks corporation
=uniper networks- 0nc,
%acAee- 0nc,
>co& corporation
!itri* syste&s- 0nc
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Than% you
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