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Firewall and its working By Mithila Palamakula. Firewall  Sits between two networks  Used to protect one from the other  Places a bottleneck between.

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Presentation on theme: "Firewall and its working By Mithila Palamakula. Firewall  Sits between two networks  Used to protect one from the other  Places a bottleneck between."— Presentation transcript:

1 Firewall and its working By Mithila Palamakula

2 Firewall  Sits between two networks  Used to protect one from the other  Places a bottleneck between the networks  All communications must pass through the bottleneck which gives us a single point of control Need  Prevent attacks from untrusted networks.  Protecting data integrity

3 administered network public Internet firewalltrusted “good guys”untrusted “bad guys” Computer Networking: Kurose, Ross

4 Evolution of firewalls: 1.Packet filters 2.Stateful packet filters 3.Application gateways

5 Packet filter  Developed by Bill Cheswick and Steve Bellovin.  Network layer.  Packet filter drop or reject packet.  Simple. Application gateway or proxy  Gene Spafford, Bill Cheswick, Marcus Ranum.  Application layer. Stateful packet filters  Dave Pressetto, Janardan Sharma and Kshity Nigam.  Between DataLink and Network layer.  Connection column in addition to packet filters.

6 Packet Filters Compare network and transport protocols to a database of rules and then forward only the packets that meet the criteria of the rules. Implemented in routers and sometimes in the TCP/IP stacks of workstation machines  In a router a filter prevents suspicious packets from reaching your network  In a TCP/IP stack it prevents that specific machine from responding to suspicious traffic https://www.google.com/search?q=packet+filters+firewall&espfw_invisible_filter.gif%3

7 Proxies  Proxy is a combination of a client and a server; internal users send requests to the server portion of the proxy which then sends the internal users requests out through its client  Hides internal users from the external network by hiding them behind the IP of the proxy  Prevents low level network protocols from going through the firewall eliminating some of the problems with NAT  Restricts traffic to only the application level protocols being proxied

8 Application gateways It is an application- specific server through which all application data must pass. Computer Networking: Kurose, Ross

9 Procedure for application gateways:  All telnet users to telnet through gateway.  Gateway sets up telnet connection to destination host  Router filter blocks all telnet connections. Deployment  Corporate gateway ( common one)  Internal segment gateway  Server-based firewall Introduction to firewall: Jason Pan

10 Conclusion  Acts as a barrier between two or more networks.  Stateful is the leading firewall technology.  A small leak in firewall effects the whole organization network.

11 Questions?

12 References Computer Networking: A top down approach, sixth edition, James F Kurose, Keith W Ross, Pearson http://www.howstuffworks.com/firewall.htm http://searchsecuritychannel.techtarget.com/feature/Network-firewall-vendors http://www.wikepedia.org/ http://technet.Microsoft.com http://www.bu.edu/

13 Thank you

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