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Virtual Private Networks (VPN) - page 11 / 21

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

11

Generic Routing Encapsulation

GRE Header (based on RFC1701, deprecated): Figure 11-2

GRE Header (based on RFC 2784 & 2890): Figure 11-4

C = 1, checksum present

Checksum: to ensure the integrity of the GRE header and the payload packet; contains a checksum of the GRE header and the payload packet

Key:

contains a number to prevent misconfiguration of packets;

may be used to identify individual traffic flow within a tunnel

Not the same as a cryptographic key

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