A YANG Module for Network Address Translation (NAT) and Network Prefix Translation (NPT)
RFC 8512
Internet Engineering Task Force (IETF) M. Boucadair, Ed.
Request for Comments: 8512 Orange
Category: Standards Track S. Sivakumar
ISSN: 2070-1721 Cisco Systems
C. Jacquenet
Orange
S. Vinapamula
Juniper Networks
Q. Wu
Huawei
January 2019
A YANG Module for
Network Address Translation (NAT) and Network Prefix Translation (NPT)
Abstract
This document defines a YANG module for the Network Address
Translation (NAT) function.
Network Address Translation from IPv4 to IPv4 (NAT44), Network
Address and Protocol Translation from IPv6 Clients to IPv4 Servers
(NAT64), customer-side translator (CLAT), Stateless IP/ICMP
Translation (SIIT), Explicit Address Mappings (EAM) for SIIT,
IPv6-to-IPv6 Network Prefix Translation (NPTv6), and Destination NAT
are covered in this document.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8512.
Boucadair, et al. Standards Track [Page 1]
RFC 8512 YANG Module for NAT and NPT January 2019
Copyright Notice
Copyright (c) 2019 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
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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.
Boucadair, et al. Standards Track [Page 2]
RFC 8512 YANG Module for NAT and NPT January 2019
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. Overview of the NAT YANG Data Model . . . . . . . . . . . . . 6
2.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2. Various Translation Flavors . . . . . . . . . . . . . . . 7
2.3. TCP/UDP/ICMP NAT Behavioral Requirements . . . . . . . . 8
2.4. Other Transport Protocols . . . . . . . . . . . . . . . . 8
2.5. IP Addresses Used for Translation . . . . . . . . . . . . 9
2.6. Port-Set Assignment . . . . . . . . . . . . . . . . . . . 9
2.7. Port-Restricted IP Addresses . . . . . . . . . . . . . . 9
2.8. NAT Mapping Entries . . . . . . . . . . . . . . . . . . . 10
2.9. Resource Limits . . . . . . . . . . . . . . . . . . . . . 13
2.10. Binding the NAT Function to an External Interface . . . . 16
2.11. Relationship to NATV2-MIB . . . . . . . . . . . . . . . . 16
2.12. Tree Structure . . . . . . . . . . . . . . . . . . . . . 17
3. NAT YANG Module . . . . . . . . . . . . . . . . . . . . . . . 24
4. Security Considerations . . . . . . . . . . . . . . . . . . . 68
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 70
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 70
6.1. Normative References . . . . . . . . . . . . . . . . . . 70
6.2. Informative References . . . . . . . . . . . . . . . . . 73
Appendix A. Some Examples . . . . . . . . . . . . . . . . . . . 75
A.1. Traditional NAT44 . . . . . . . . . . . . . . . . . . . . 75
A.2. Carrier Grade NAT (CGN) . . . . . . . . . . . . . . . . . 76
A.3. CGN Pass-Through . . . . . . . . . . . . . . . . . . . . 80
A.4. NAT64 . . . . . . . . . . . . . . . . . . . . . . . . . . 80
A.5. Stateless IP/ICMP Translation (SIIT) . . . . . . . . . . 81
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