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Personal Info

Personal Info. Presenter: Mr. NHEAN Sophan Position: Desktop Support Company: Khalibre Co,. Ltd E-mail: sophan.nhean@gmail.com Tel: 0979514961 or 086493591 Skype: sophan.nhean Facebook: www.facebook.com/sophan.nhean. Prepared by: Mr. NHEAN Sophan.

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Personal Info

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  1. Personal Info • Presenter: Mr. NHEAN Sophan • Position: Desktop Support • Company: Khalibre Co,. Ltd • E-mail: sophan.nhean@gmail.com • Tel: 0979514961 or 086493591 • Skype: sophan.nhean • Facebook: www.facebook.com/sophan.nhean Prepared by: Mr. NHEAN Sophan

  2. What Firewall can do to protect your Network? Firewall Prepared by: Mr. NHEAN Sophan

  3. Agenda • What is a firewall? • What does a firewall do? • What can’t a firewall do? • Who need a firewall? • How does a firewall work? • What are the protection methods of firewall? • How do we implement a firewall? • Conclusion – Benefits of firewall • Scenario • Questions and Answers Prepared by: Mr. NHEAN Sophan

  4. What is a firewall? • Firewall is a component or set of computer that restrict access between a protected network and the Internet or between a sets of networks. • Protects networked computers from intentional hostile intrusion from outside. • Places a bottleneck (or Choke Point) between the networks • All communications must pass through the bottleneck – this gives us a single point of control Prepared by: Mr. NHEAN Sophan

  5. What is a firewall? • There are two types of firewall • Hardware firewall device • Fortinet • Juniper • CISCO ASA • Software firewall program • IP Chains & IPTables • IPCop • SELinux • ISA Prepared by: Mr. NHEAN Sophan

  6. What can a firewall do? • A firewall examines all traffic routed between two networks to see if it meets certain criteria (allowed if it does, otherwise it dropped) • Focus on security decision (Choke point) • Enforce security policy • Log Internet Activities efficiently Prepared by: Mr. NHEAN Sophan

  7. What can a firewall do? • It filters traffic base on: • Source and Destination IP address • Source and Destination Port number • Protocols used • It protect your computer and personal information from: • Hackers break into your system • Can prevent some kind of virus Prepared by: Mr. NHEAN Sophan

  8. What can't a firewall do? A firewall can’t protect you against: • Phishing scam, spyware or viruses spread through email. • Malicious insider: people who gain physical access to your computer or network • For an unprotected wireless network • After network has been compromised • Connections that don’t go through firewall (Modem users) • Completely new threats Prepared by: Mr. NHEAN Sophan

  9. Who need a firewall? • Anyone who is responsible for a private network that is connected to a public network. • Big, Medium, and Small Enterprise • Anyone who connect from single computer to internet via modem, etc. Prepared by: Mr. NHEAN Sophan

  10. How does firewall work? • A firewall may allow all traffic through unless it meets certain criteria, or it may deny all traffic unless it meets certain criteria.  Outbound Inbound Basic Firewall Operation Prepared by: Mr. NHEAN Sophan

  11. What are the protection methods of firewall? • Packet Filtering • Rejects TCP/IP packets from unauthorized hosts and/or connection attempts but unauthorized hosts • Network Address Translation (NAT) • Translates the addresses of internal hosts so as to hide them from the outside world • Also known as IP masquerading • Proxy Services • Makes high level application level connections to external hosts on behalf of internal hosts to completely break the network connection between internal and external hosts Prepared by: Mr. NHEAN Sophan

  12. How do we implement the firewall? • Determine the access denial methodology to use • Determine Inbound access policy • Determine Outbound access policy • Decide whether to buy a complete firewall product, have one implemented by a systems integrator or implement one yourself. Prepared by: Mr. NHEAN Sophan

  13. Benefits of firewall • Protects private Local Area Network form hostile intrusion from internet • Block harmful packet to reach important resources • Allows network administrators to offer access to specific types of Internet services to selected LAN users • It can protect: • Your Data: the information you keep on computers • Your resource: the computers themselves • Your reputation: Intruders on the Internet appear with your identity. Prepared by: Mr. NHEAN Sophan

  14. Challenging question Isa firewall sufficient to secure my network or do I need anything else? NO! Prepared by: Mr. NHEAN Sophan

  15. Scenario Firewall Scenario Prepared by: Mr. NHEAN Sophan

  16. Scenario 1: Saturday, Midnight Prepared by: Mr. NHEAN Sophan

  17. 5 Minutes later Prepared by: Mr. NHEAN Sophan

  18. Scenario 2: Monday, Midnight OK, let’s try the Insurance company…. This should take about 5 minutes! Black Hacker Prepared by: Mr. NHEAN Sophan

  19. 1 minutes later Information Security Manager Insurance Company Prepared by: Mr. NHEAN Sophan

  20. 5 Hours later Black Hacker Prepared by: Mr. NHEAN Sophan

  21. Questions? Thanks for Your Paying Attention! Source by Building Internet Firewalls Elizabeth D. Zwicky, Simon Cooper & D. Brent Chapman Prepared by: Mr. NHEAN Sophan

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