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Introduction to Firewall Technologies

Introduction to Firewall Technologies. Objectives. Understand basic concepts of network security Master mandatory firewall technologies. Upon completion of this course, you will be able to:. Contents. Network Security Firewall Technologies. Network Security Overview.

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Introduction to Firewall Technologies

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  1. Introduction to Firewall Technologies

  2. Objectives • Understand basic concepts of network security • Master mandatory firewall technologies Upon completion of this course, you will be able to:

  3. Contents Network Security Firewall Technologies 3Com Confidential.

  4. Network Security Overview • Network security is a practical issue on the Internet • Network security is a comprehensive technology • Network security has two meanings: • Guarantee security of the internal LAN (away from illegal invasion) • Protect security of data exchange with the external network • Perfection and update of the network security technology

  5. Coverage of Network Security • Coverage of network security • Prevent physical lines of the network from being easily attacked • Effectively identify legal and illegal users • Implement effective access control • Guarantee concealment of the internal network • Offer an effective anti-forgery means to focus on major data • Provide security management for network equipment and network topology • Provide virus protection • Improve security protection consciousness • Category of network security devices

  6. Contents Network Security Firewall Technologies 3Com Confidential.

  7. Mandatory Firewall Technologies • As for different kinds of potential security hazards on the network, the firewall must have the following security features: • Network isolation & access control • Attack defending • Network Address Translation (NAT) • Application Specific Packet Filter (ASPF) • ID authentication • Content filter • Security management

  8. Network Isolation & Access Control Trusted Zone and Untrusted Zone cannot access each other Firewall Trusted Zone Untrusted Zone DMZ • Trusted Zone -> DMZ, accessing POP3 and SMTP services • DMZ -> Trusted Zone, accessing no services • Untrusted Zone -> DMZ, accessing POP3 and SMTP services • DMZ -> Untrusted Zone, accessing all services Switch Email Server

  9. Attack Defending Hacker Prevent DoS attack Firewall Trusted Zone Untrusted Zone Normal user

  10. Network Address Translation (NAT) 10.1.1.100 → 210.190.100.23 Web Server Firewall 10.1.1.1 210.190.100.23 10.1.1.0/24 10.1.1.100 ← 210.190.100.23

  11. Application Specific Packet Filter (ASPF) Monitor packets in the communication process Dynamically create and delete filter rules

  12. ID Authentication Firewall Access the Internet User name and password? Input the user name and password Authentication success Normal Internet access

  13. Content Filter Normal website Healthy contents Harmful website • Internet Harmful contents • Filter harmful websites • Remove malicious webpage contents

  14. Security Management Monitoring terminal Console SecPath Internet Log host Log buffer

  15. Summary • Basic concepts of network security • Mandatory firewall technologies

  16. Thank you

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