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FireWall Technology (TM6105) By Somboon Ingsakulsomboon ID:4229811

FireWall Technology (TM6105) By Somboon Ingsakulsomboon ID:4229811. Contents. What is a Firewall? TCP/IP Stack Methods of Securing Networks What is DOS? Content Security VPN. What Is A Firewall?.

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FireWall Technology (TM6105) By Somboon Ingsakulsomboon ID:4229811

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  1. FireWallTechnology(TM6105)BySomboon IngsakulsomboonID:4229811

  2. Contents • What is a Firewall? • TCP/IP Stack • Methods of Securing Networks • What is DOS? • Content Security • VPN

  3. What Is A Firewall? Connects internal and external networks with varying levels of trust, by implementing security policies regarding network communication Untrusted Networks & Servers Trusted Networks Internet Firewall Untrusted Users Intranet Router Server Segment Trusted Users Public Accessible Networks & Servers

  4. Defining A Firewall • A firewall is a system designed to prevent unauthorized access to, or from, an internal network. Firewalls also do the following: • Track and control data • Ensures that data meets security policy rules • Acts as a locked door between internal and external networks

  5. TCP/IP Stack

  6. Packets

  7. Methods of Securing Networks Application Presentation Session Transport Network Data Link Physical • Application Layer Gateway (Proxy) • Application Level • Packet Filtering • Network Level • Stateful Inspection • FireWall-1: Before Network Level

  8. Packet Filtering • Pros • Inexpensive • Application Transparency • Quicker than application layer gateways • Cons • Low Security • Limited access to packet header • Limited screening above network layer Application Presentation Session Transport Network Data Link Physical

  9. Application Layer Gateway • Pros • Good Security • Full application-layer awareness • Cons • Poor Scalability • Proxies cannot provide for UDP… • Most proxies non-transparent • Vulnerable to OS… • Expensive performance cost Application Presentation Session Transport Network Data Link Physical

  10. Stateful Inspection • Good Security • Full Application-layer awareness • High Performance • Scalability • Extensible • Transparency Application Presentation Session Transport Network Data Link Physical

  11. Network Address Translation

  12. Availability of IP Addresses • RFC 1918 has reserved a set of IP network addresses that can be used for address translation: • 1 Class A Network Number: 10.0.0.0 • 16 Class B Network Numbers: 172.16.0.0 through 172.31.0.0 • 256 Class C Network Numbers: 192.168.0.0 through 192.168.255.0 • Internal networks with RFC 1918 network numbers can reach all hosts on the Internet, since no hosts on the Internet can use them.

  13. What is DOS ? Denial of Service: An active packet may overload a resource or service due to constantly consuming network connections or using a great portion of the CPU cycles available. The node cannot function properly under these circumstances and another active packet cannot be executed or forwarded.

  14. TCP/IP Three-Step Handshake

  15. SYN Flooding Attack 1 Client attacks server by sending a flood of SYN packets with a spoofed IP address. 2 Server tries to send SYN/ACK to unreachable IP.3 ACK is not received from Client.

  16. SYN Defender

  17. Content Security

  18. Virtual Private Network

  19. Question ?

  20. Thank You

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