NAT traversal for LISP
draft-ermagan-lisp-nat-traversal-18
Network Working Group V. Ermagan
Internet-Draft Google
Intended status: Experimental D. Farinacci
Expires: May 6, 2021 lispers.net
D. Lewis
F. Maino
M. Portoles
Cisco Systems, Inc.
J. Skriver
Arista
C. White
Logicalelegance, Inc.
A. Lopez
A. Cabellos
UPC/BarcelonaTech
November 2, 2020
NAT traversal for LISP
draft-ermagan-lisp-nat-traversal-18
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 the
LISP Re-encapsulating Tunnel Router (RTR) network element, which acts
as an anchor point in the data plane, forwarding traffic from
unmodified LISP devices through the NAT.
Status of This Memo
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This Internet-Draft will expire on May 6, 2021.
Ermagan, et al. Expires May 6, 2021 [Page 1]
Internet-Draft NAT traversal for LISP November 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Definition of Terms . . . . . . . . . . . . . . . . . . . . . 3
3. Basic Overview . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. LISP NAT Traversal Overview . . . . . . . . . . . . . . . 6
4. LISP RTR Message Details . . . . . . . . . . . . . . . . . . 7
4.1. Info-Request Message . . . . . . . . . . . . . . . . . . 7
4.2. LISP Info-Reply . . . . . . . . . . . . . . . . . . . . . 9
4.3. LISP Map-Register Message . . . . . . . . . . . . . . . . 11
4.4. LISP Map-Notify . . . . . . . . . . . . . . . . . . . . . 12
4.5. LISP Data-Map-Notify Message . . . . . . . . . . . . . . 13
5. Protocol Operations . . . . . . . . . . . . . . . . . . . . . 15
5.1. xTR Processing . . . . . . . . . . . . . . . . . . . . . 15
5.1.1. ETR Registration . . . . . . . . . . . . . . . . . . 16
5.1.2. Map-Request and Map-Reply Handling . . . . . . . . . 17
5.1.3. xTR Sending and Receiving Data . . . . . . . . . . . 18
5.2. Map-Server Processing . . . . . . . . . . . . . . . . . . 18
5.3. RTR Processing . . . . . . . . . . . . . . . . . . . . . 19
5.3.1. RTR Data Forwarding . . . . . . . . . . . . . . . . . 21
5.4. Multi-homed xTRs . . . . . . . . . . . . . . . . . . . . 22
5.5. Updating contents of EID-to-RLOC Mappings . . . . . . . . 23
5.6. Example . . . . . . . . . . . . . . . . . . . . . . . . . 24
6. Security Considerations . . . . . . . . . . . . . . . . . . . 27
6.1. Acknowledgments . . . . . . . . . . . . . . . . . . . . . 27
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