Network Working Group V. Ermagan
Internet-Draft D. Farinacci
Intended status: Experimental D. Lewis
Expires: October 01, 2013 J. Skriver
F. Maino
Cisco Systems, Inc.
C. White
Logicalelegance, Inc.
March 30, 2013
NAT traversal for LISP
draft-ermagan-lisp-nat-traversal-03.txt
Abstract
This document describes a mechanism for IPv4 NAT traversal for LISP
tunnel routers (xTR) and LISP Mobile Nodes (LISP-MN) behind a NAT
device. A LISP device both detects the NAT and initializes its
state. Forwarding to the LISP device through a NAT is enabled by a
new network element, the LISP Re-encapsulating Tunnel Router (RTR),
which acts as an anchor point in the data plane, forwarding traffic
from unmodified LISP devices through the NAT.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Definition of Terms . . . . . . . . . . . . . . . . . . . . . 3
3. Basic Overview . . . . . . . . . . . . . . . . . . . . . . . 4
4. LISP RTR Message Details . . . . . . . . . . . . . . . . . . 5
4.1. Info-Request Message . . . . . . . . . . . . . . . . . . 5
4.2. LISP Info-Reply . . . . . . . . . . . . . . . . . . . . . 7
4.3. LISP Map-Register Message . . . . . . . . . . . . . . . . 8
4.4. LISP Map-Notify . . . . . . . . . . . . . . . . . . . . . 9
4.5. LISP Data-Map-Notify Message . . . . . . . . . . . . . . 10
5. Protocol Operations . . . . . . . . . . . . . . . . . . . . . 11
5.1. xTR Processing . . . . . . . . . . . . . . . . . . . . . 11
5.1.1. ETR Registration . . . . . . . . . . . . . . . . . . 12
5.1.2. Map-Request and Map-Reply Handling . . . . . . . . . 13
5.1.3. xTR Sending and Receiving Data . . . . . . . . . . . 14
5.2. Map-Server Processing . . . . . . . . . . . . . . . . . . 15
5.3. RTR Processing . . . . . . . . . . . . . . . . . . . . . 15
5.3.1. RTR Data Forwarding . . . . . . . . . . . . . . . . . 17
5.4. Example . . . . . . . . . . . . . . . . . . . . . . . . . 17
6. Security Considerations . . . . . . . . . . . . . . . . . . . 20
6.1. Acknowledgments . . . . . . . . . . . . . . . . . . . . . 21
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 21
8. Normative References . . . . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 21
1. Introduction
The Locator/ID Separation Protocol [LISP] defines a set of functions
for encapsulating routers to exchange information used to map from
Endpoint Identifiers (EIDs) to routable Routing Locators (RLOCs).
The assumption that the LISP Tunnel Routers are reachable at their
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