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Virtual Private Networks (VPN) - page 10 / 21

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

10

Generic Routing Encapsulation (GRE)

Provides low overhead tunneling (often between two private networks)

Does not provide encryption

Used to encapsulate an arbitrary layer protocol over another arbitrary layer protocol:

delivery header + GRE header + payload packet

Mostly IPv4 is the delivery mechanism for GRE with any arbitrary protocol nested inside

e.g., IP protocol type 47: GRE packets using IPv4 headers

RFCs:

RFC1701 Generic Routing Encapsulation (GRE) S. Hanks, T. Li, D. Farinacci, P. Traina, October 1994 (INFORMATIONAL)

RFC2784 Generic Routing Encapsulation (GRE) D. Farinacci, T. Li, S. Hanks, D. Meyer, P. Traina, March 2000 (PROPOSED STANDARD)

RFC2890 Key and Sequence Number Extensions to GRE G. Dommety, September 2000 (PROPOSED STANDARD)

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