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Virtual Private Networks (VPN) - page 12 / 21

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

12

Generic Routing Encapsulation

Summary:

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GRE mainly perform ‘tunneling’.

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Does not provide a means to securely encrypt its payload

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Often relies on application layer to provide encryption

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May be used together with a network layer encryption (such as IPsec)

Example 1: use GRE to encapsulate non-IP traffic and then encrypt the GRE packet using IPsec

Example 2: use GRE to encapsulate multicast traffic, and then encrypt the GRE packet using IPsec

Question: Why not simply use IPsec?

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