Network Security Through FIREWALL

1. 11
Network Security ThroughNetwork Security Through
FIREWALLFIREWALL
Presented By :-Presented By :-
Creativedev.inCreativedev.in

2. 22
Desirable feature of NetworkDesirable feature of Network
• High Bandwidth at low costHigh Bandwidth at low cost
• SECURITYSECURITY
• Low cost hardware and software at theLow cost hardware and software at the
client sideclient side

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Hierarchy of variousHierarchy of various
SECURITY levelsSECURITY levels
• BIOS level SecurityBIOS level Security
• Operating System level SecurityOperating System level Security
• Network Operating System SecurityNetwork Operating System Security
• Security Based upon IP addressSecurity Based upon IP address
• E-application SecurityE-application Security

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SECURITY Issues whileSECURITY Issues while
connecting on the Internetconnecting on the Internet
• Protect confidential informationProtect confidential information
– Network Packet SniffersNetwork Packet Sniffers
– IP SpoofingIP Spoofing
– Password AttacksPassword Attacks
– Man-in-the-middle AttacksMan-in-the-middle Attacks
– Application Layer AttacksApplication Layer Attacks

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About FIREWALLAbout FIREWALL
• ““A FIREWALL is a software, which is usedA FIREWALL is a software, which is used
for controlling and analyzing data passingfor controlling and analyzing data passing
between two networks.”between two networks.”
• Placed at the point of connection betweenPlaced at the point of connection between
two networkstwo networks
• Barrier to keep destructive forces awayBarrier to keep destructive forces away

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7. 77
FIREWALL ClassificationFIREWALL Classification
• Packet Filter Firewall (Stateless Inspection)Packet Filter Firewall (Stateless Inspection)
• Application Proxy FirewallApplication Proxy Firewall
• Stateful Packet filtering FirewallStateful Packet filtering Firewall
• Packet filtering based upon contentPacket filtering based upon content
• Network Address TranslationNetwork Address Translation

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Setup of FIREWALLSetup of FIREWALL
• Dual-homed gatewayDual-homed gateway

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Protection by FIREWALLProtection by FIREWALL
• Remote loginRemote login
• Application BackdoorsApplication Backdoors
• SMTP session hijackingSMTP session hijacking
• Operating System BugsOperating System Bugs
• Denial of ServiceDenial of Service
• DNS SpoofingDNS Spoofing

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Protection by FIREWALLProtection by FIREWALL
• E-mail bombsE-mail bombs
• MacrosMacros
• VirusVirus
• SpamSpam
• Redirect bombsRedirect bombs
• Source RoutingSource Routing

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Beyond FIREWALLS…Beyond FIREWALLS…
• VPNVPN
– A method of achieving security by use ofA method of achieving security by use of
software techniquessoftware techniques
– Use of unsecured public network likeUse of unsecured public network like
internet to transmit the data.internet to transmit the data.
• IPSecIPSec
– is a collection of protocols (by IETF )is a collection of protocols (by IETF )
– two modes are usedtwo modes are used
• Tunnel modeTunnel mode
• Transport modeTransport mode

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Network Security UtilitiesNetwork Security Utilities
offered by popular O.S. vendorsoffered by popular O.S. vendors
• iptables and ipchains utilities in LINUX foriptables and ipchains utilities in LINUX for
FIREWALL configurationFIREWALL configuration
• Advanced stateful packet and application-Advanced stateful packet and application-
layer inspection firewall including VPN inlayer inspection firewall including VPN in
Microsoft Internet Security and ccelerationMicrosoft Internet Security and cceleration
(ISA) Server 2004(ISA) Server 2004

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ConclusionConclusion
• With explosive growth of Internet to ‘always on’With explosive growth of Internet to ‘always on’
connectivity, security has become a concern toconnectivity, security has become a concern to
network administrators and individuals.network administrators and individuals.
• Even organizations without having anyEven organizations without having any
confidential information can find themselves toconfidential information can find themselves to
be victimized, which can result in loss/damage ofbe victimized, which can result in loss/damage of
services/equipment.services/equipment.
• To explore some of most common networkTo explore some of most common network
security problems, suggested possible solutionsecurity problems, suggested possible solution
is FIREWALL.is FIREWALL.

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Thank YouThank You
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