Generic UDP Encapsulation
draft-herbert-gue-02

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Replaced by draft-ietf-nvo3-gue
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Internet Draft                                                T. Herbert
<draft-herbert-gue-02.txt>                                        Google
Category: Experimental                                           L. Yong
Expires April 2015                                            Huawei USA
                                                        October 24, 2014

                       Generic UDP Encapsulation
                       <draft-herbert-gue-02.txt>

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Herbert, Yong              Expires April 2015                   [Page 1]
Internet Draft              herbert-gue.txt             October 24, 2014

Abstract          

   This specification describes Generic UDP Encapsulation (GUE), which
   is a scheme for using UDP to encapsulate packets of arbitrary IP
   protocols for transport across layer 3 networks. By encapsulating
   packets in UDP, specialized capabilities in networking hardware for
   efficient handling of UDP packets can be leveraged. GUE specifies
   basic encapsulation methods upon which higher level constructs, such
   tunnels and overlay networks for network virtualization, can be
   constructed. GUE is extensible by allowing optional meta data as part
   of the encapsulation, and is generic in that it can encapsulate
   packets of various IP protocols.

Table of Contents

   1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2. Packet formats . . . . . . . . . . . . . . . . . . . . . . . . . 4
      2.1. GUE header preamble . . . . . . . . . . . . . . . . . . . . 4
      2.2. GUE header  . . . . . . . . . . . . . . . . . . . . . . . . 5
      2.3. Flags and optional fields . . . . . . . . . . . . . . . . . 6
   3. Message types  . . . . . . . . . . . . . . . . . . . . . . . . . 7
      3.1. Control messages  . . . . . . . . . . . . . . . . . . . . . 7
      3.2. Data messages . . . . . . . . . . . . . . . . . . . . . . . 7
   4. Operation  . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
      4.1. Network tunnel encapsulation  . . . . . . . . . . . . . . . 8
      4.2. Transport layer encapsulation . . . . . . . . . . . . . . . 8
      4.3. Encapsulator operation  . . . . . . . . . . . . . . . . . . 8
      4.4. Decapsulator operation  . . . . . . . . . . . . . . . . . . 9
      4.5. Router and switch operation . . . . . . . . . . . . . . . . 9
      4.6. Middlebox interactions  . . . . . . . . . . . . . . . . . . 9
      4.7. NAT . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
      4.8. UDP checksum  . . . . . . . . . . . . . . . . . . . . . .  10
      4.9. MTU and fragmentation issues  . . . . . . . . . . . . . .  10
      4.10 Congestion control  . . . . . . . . . . . . . . . . . . .  11
   5. Inner flow identifier properties . . . . . . . . . . . . . . .  11
      5.1. Flow classification . . . . . . . . . . . . . . . . . . .  11
      5.2. Inner flow identifier properties  . . . . . . . . . . . .  12
   6. Motivation for GUE . . . . . . . . . . . . . . . . . . . . . .  12
   7. Security Considerations  . . . . . . . . . . . . . . . . . . .  14
      7.1. GUE security fields . . . . . . . . . . . . . . . . . . .  14
      7.2. GUE and IPsec . . . . . . . . . . . . . . . . . . . . . .  14
   8. IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  15
   9. References . . . . . . . . . . . . . . . . . . . . . . . . . .  16
      9.1. Normative References  . . . . . . . . . . . . . . . . . .  16
      9.2. Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A: NIC processing for GUE  . . . . . . . . . . . . . . .  17
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