Generic Routing Encapsulation (GRE) Key Option for Proxy Mobile IPv6

This RFC 5845 was published in 2010.

Abstract

This specification defines a new mobility option for allowing the mobile access gateway and the local mobility anchor to negotiate Generic Routing Encapsulation (GRE) encapsulation mode and exchange the downlink and uplink GRE keys that are used for marking the downlink and uplink traffic that belong to a specific mobility session.
In addition, the same mobility option can be used to negotiate the GRE encapsulation mode without exchanging the GRE keys.

RFC 5845 introduction

The Proxy Mobile IPv6 specification [RFC5213] and IPv4 Support for Proxy Mobile IPv6 [RFC5844] allow the use of IPv6 and IPv4 encapsulation modes as specified in [RFC2473] and [RFC2003] for the tunneled traffic between the local mobility anchor (LMA) and the mobile access gateway (MAG).
There are scenarios where these encapsulation modes are not sufficient to uniquely identify the destination of packets of a specific mobility session.
Thus, there is a need for an encapsulation mode with richer semantics.
The Generic Routing Encapsulation (GRE) [RFC2784], and the Key extension as defined in [RFC2890], has the required semantics to allow such a distinction for use in Proxy Mobile IPv6.

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