10_NWS_IPsec_VPN.ppt - Network Security CT037-3-2 Version VC1 Virtual Private Network Topic Structure of The Lesson • • • • • IPSec IP

10_NWS_IPsec_VPN.ppt - Network Security CT037-3-2 Version...

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Virtual Private Network Network Security CT037-3-2 & Version VC1
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CT037-3-2 Network Security Virtual Private Network 2 of 39 IPSec IP Security Architecture Transport & Tunnel Modes Oakley ISAKMP Topic & Structure of The Lesson
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CT037-3-2 Network Security Virtual Private Network 3 of 39 At the end of this session you should be able to : Describe Site-to-Site IPsec VPN Operations IPsec Learning Outcomes
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CT037-3-2 Network Security Virtual Private Network 4 of 39 If you have mastered this topic, you should be able to use the following terms correctly in your assignments and exams : IPSec IP Security Architecture Transport & Tunnel Modes Oakley ISAKMP Key Terms You Must Be Able To Use
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CT037-3-2 Network Security Virtual Private Network 5 of 39 IP Security various application security mechanisms eg. S/MIME, PGP, Kerberos, SSL/HTTPS security concerns cross protocol layers hence would like security implemented by the network for all applications authentication & encryption security features included in next-generation IPv6 also usable in existing IPv4
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CT037-3-2 Network Security Virtual Private Network 6 of 39 IPSec general IP Security mechanisms provides authentication confidentiality key management applicable to use over LANs, across public & private WANs, & for the Internet
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CT037-3-2 Network Security Virtual Private Network 7 of 39 IPSec Uses
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CT037-3-2 Network Security Virtual Private Network 8 of 39 Benefits of IPSec in a firewall/router provides strong security to all traffic crossing the perimeter in a firewall/router is resistant to bypass is below transport layer, hence transparent to applications can be transparent to end users can provide security for individual users secures routing architecture
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CT037-3-2 Network Security Virtual Private Network 9 of 39 IP Security Architecture mandatory in IPv6, optional in IPv4 have two security header extensions: Authentication Header (AH) Encapsulating Security Payload (ESP) Key Exchange function VPNs want both authentication/encryption hence usually use ESP specification is quite complex numerous RFC’s 2401/2402/2406/2408
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