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Virtual Private Networks (VPN) - page 7 / 21

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http://sce.uhcl.edu/yang/teaching/.../VPN.ppt

7

VPNs at different OSI layers

Network layer VPNs (Layer-3)

Created using layer 3 tunneling and/or encryption

Q: difference between encapsulation and tunneling ?

See http://computing-dictionary.thefreedictionary.com/tunneling%20protocol

Example: IPsec, GRE, L2TP (tunneling layer 2 traffic by using the IP layer to do that)

Advantages:

A ‘proper’ layer

Low enough: transparency

High enough: IP addressing

Cisco focuses on this layer for its VPNs.

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