The Subnetwork Encapsulation and Adaptation Layer (SEAL)
draft-templin-intarea-seal-55

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Document Type Active Internet-Draft (individual)
Last updated 2013-05-03
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Network Working Group                                    F. Templin, Ed.
Internet-Draft                              Boeing Research & Technology
Obsoletes: rfc5320 (if approved)                            May 03, 2013
Intended status: Informational
Expires: November 4, 2013

        The Subnetwork Encapsulation and Adaptation Layer (SEAL)
                   draft-templin-intarea-seal-55.txt

Abstract

   This document specifies a Subnetwork Encapsulation and Adaptation
   Layer (SEAL).  SEAL operates over virtual topologies configured over
   connected IP network routing regions bounded by encapsulating border
   nodes.  These virtual topologies are manifested by tunnels that may
   span multiple IP and/or sub-IP layer forwarding hops, where they may
   incur packet duplication, packet reordering, source address spoofing
   and traversal of links with diverse Maximum Transmission Units
   (MTUs).  SEAL uniquely addresses these issues through the
   encapsulation and messaging mechanisms specified in this document.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on November 4, 2013.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

Templin                 Expires November 4, 2013                [Page 1]
Internet-Draft                    SEAL                          May 2013

   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Templin                 Expires November 4, 2013                [Page 2]
Internet-Draft                    SEAL                          May 2013

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Motivation . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.2.  Approach . . . . . . . . . . . . . . . . . . . . . . . . .  6
     1.3.  Differences with RFC5320 . . . . . . . . . . . . . . . . .  7
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  8
   3.  Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 10
   4.  Applicability Statement  . . . . . . . . . . . . . . . . . . . 10
   5.  SEAL Specification . . . . . . . . . . . . . . . . . . . . . . 11
     5.1.  SEAL Tunnel Model  . . . . . . . . . . . . . . . . . . . . 11
     5.2.  SEAL Model of Operation  . . . . . . . . . . . . . . . . . 12
     5.3.  SEAL Header and Trailer Format . . . . . . . . . . . . . . 13
     5.4.  ITE Specification  . . . . . . . . . . . . . . . . . . . . 15
       5.4.1.  Tunnel Interface MTU . . . . . . . . . . . . . . . . . 15
       5.4.2.  Tunnel Neighbor Soft State . . . . . . . . . . . . . . 16
       5.4.3.  SEAL Layer Pre-Processing  . . . . . . . . . . . . . . 17
       5.4.4.  SEAL Encapsulation and Segmentation  . . . . . . . . . 18
       5.4.5.  Outer Encapsulation  . . . . . . . . . . . . . . . . . 20
       5.4.6.  Path Probing and ETE Reachability Verification . . . . 21
       5.4.7.  Processing ICMP Messages . . . . . . . . . . . . . . . 21
       5.4.8.  IPv4 Middlebox Reassembly Testing  . . . . . . . . . . 22
       5.4.9.  Stateful MTU Determination . . . . . . . . . . . . . . 23
       5.4.10. Detecting Path MTU Changes . . . . . . . . . . . . . . 24
     5.5.  ETE Specification  . . . . . . . . . . . . . . . . . . . . 24
       5.5.1.  Minimum Reassembly Buffer Requirements . . . . . . . . 24
       5.5.2.  Tunnel Neighbor Soft State . . . . . . . . . . . . . . 24
       5.5.3.  IP-Layer Reassembly  . . . . . . . . . . . . . . . . . 25
       5.5.4.  Decapsulation and Re-Encapsulation . . . . . . . . . . 25
     5.6.  The SEAL Control Message Protocol (SCMP) . . . . . . . . . 27
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