FireWall

Contents ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is FireWall ? ,[object Object],[object Object]

Software vs. Hardware Firewalls Software Firewall Hardware Firewall ,[object Object],[object Object],[object Object],[object Object],Norton Internet Security Cisco PIX Mcafee Internet Security NetScreen Outpost WatchGuard Ms. ISA Server Check Point

How does a Firewall work? ,[object Object],[object Object],[object Object],sent sent received received packets packets

How a firewall works ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],LOG Alert Reset Fire Wall 

Types of FireWall Techniques ,[object Object],[object Object],[object Object],[object Object]

Packet filter - It looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules . Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing . Packet Filtering Applications Presentations Sessions Transport DataLink Physical DataLink Physical Router Applications Presentations Sessions Transport DataLink Physical Network Network

Application gateway Application gateway (Proxy Server)- User uses TCP/IP applications, such as FTP and Telnet servers. This is very effective, but can impose a performance degradation. Applications Presentations Sessions Transport DataLink Physical Network DataLink Physical Applications Presentations Sessions Transport DataLink Physical Application Gateway Applications Presentations Sessions Transport Network Network Telnet HTTP FTP

Circuit-level gateway ,[object Object],[object Object],[object Object],[object Object]

Bastion host ,[object Object],[object Object]

Conclusion ,[object Object],[object Object]

What a personal firewall can do ? ,[object Object],[object Object],[object Object],[object Object],[object Object]

What a personal firewall cannot do ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Virus can jump Firewall !! F I R E W A L L Deadly Virus

SECURED Firewall Thank You…… Source – >CNS Text Book (William Stallings) > Wikipedia

FireWall

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FireWall