Generic UDP Encapsulation
draft-herbert-gue-00

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Internet Draft                                                T. Herbert
<draft-herbert-gue-00.txt>                                        Google
Category: Experimental
Expires June 2014                                      December 20, 2013

                       Generic UDP Encapsulation
                       <draft-herbert-gue-00.txt>

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   This Internet-Draft is submitted in full conformance with the
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Herbert                    Expires June 2014                    [Page 1]
Internet Draft              herbert-gue.txt            December 20, 2013

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, can be constructed.

Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2. Packet formats  . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.1. GUE header preamble . . . . . . . . . . . . . . . . . . . .  3
     2.2. GUE encapsulation header  . . . . . . . . . . . . . . . . .  4
   3. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1. Encapsulator operation  . . . . . . . . . . . . . . . . . .  6
     3.2. Decapsulator operation  . . . . . . . . . . . . . . . . . .  7
     3.3. Router and switch operation . . . . . . . . . . . . . . . .  7
     3.4. Middlebox and NAT interactions  . . . . . . . . . . . . . .  7
     3.5. UDP checksum  . . . . . . . . . . . . . . . . . . . . . . .  8
     3.6. MTU and fragmentation issues  . . . . . . . . . . . . . . .  8
   4. Inner flow identifier properties  . . . . . . . . . . . . . . .  8
     4.1. Flow classification . . . . . . . . . . . . . . . . . . . .  8
     4.2. Inner flow identifier properties  . . . . . . . . . . . . .  9
   5. Motivation for GUE  . . . . . . . . . . . . . . . . . . . . . . 10
   6. Security Considerations . . . . . . . . . . . . . . . . . . . . 11
   7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 11
   8. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     8.1. Normative References  . . . . . . . . . . . . . . . . . . . 12
     8.2. Informative References  . . . . . . . . . . . . . . . . . . 12
   Appendix A: NIC processing for GUE . . . . . . . . . . . . . . . . 13
     A.1. Receive multi-queue . . . . . . . . . . . . . . . . . . . . 13
     A.2. Checksum offload  . . . . . . . . . . . . . . . . . . . . . 14
       A.2.1. Transmit checksum offload . . . . . . . . . . . . . . . 14
       A.2.2. Receive checksum offload  . . . . . . . . . . . . . . . 14
     A.3. Transmit Segmentation Offload . . . . . . . . . . . . . . . 14
     A.4. Large Receive Offload . . . . . . . . . . . . . . . . . . . 15
   Appendix B: Privileged ports . . . . . . . . . . . . . . . . . . . 16
   Appendix C: Inner flow identifier as a route selector  . . . . . . 16
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16

1. Introduction

   This specification describes a general method for encapsulating
   packets of arbitrary IP protocols within User Datagram Protocol (UDP)
   [RFC0768] packets. Encapsulating packets in UDP facilitates efficient
 

Herbert                    Expires June 2014                    [Page 2]
Internet Draft              herbert-gue.txt            December 20, 2013
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