Port Control Protocol R. Penno
Internet-Draft D. Wing
Intended status: Standards Track Cisco
Expires: July 25, 2013 M. Boucadair
France Telecom
January 21, 2013
PCP Support for Nested NAT Environments
draft-penno-pcp-nested-nat-03
Abstract
Nested NATs or multi-layer NATs are already widely deployed. They
are characterized by two or more NAT devices in the path of packets
from the subscriber to the Internet. Moreover, NAT devices current
deployed are PCP unaware and It is assumed that NAT aware PCP devices
will take a long time to be rolled out. Therefore in order to lower
the adoption barrier of PCP and make it work for current deployed
networks, this document proposes a few mechanisms for PCP-enabled
applications to work through NATs with varying levels of PCP protocol
support.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
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 July 25, 2013.
Copyright Notice
Penno, et al. Expires July 25, 2013 [Page 1]
Internet-Draft penno-nested-nat January 2013
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Problem Statement . . . . . . . . . . . . . . . . . . . . 3
1.3. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. PCP MAP Nested NAT Methods . . . . . . . . . . . . . . . . . . 4
2.1. PCP and UPnP unaware Intermediate NATs . . . . . . . . . . 5
2.2. PCP Server intermediate NAT . . . . . . . . . . . . . . . 7
2.3. UPnP enabled intermediate NAT . . . . . . . . . . . . . . 8
2.4. PCP Proxy Intermediate NAT . . . . . . . . . . . . . . . . 8
2.4.1. PCP Proxy Discovery . . . . . . . . . . . . . . . . . 9
3. PCP PEER Nested NAT Methods . . . . . . . . . . . . . . . . . 9
3.1. Send-then-connect . . . . . . . . . . . . . . . . . . . . 9
3.2. Connect-then-send . . . . . . . . . . . . . . . . . . . . 10
4. RECEIVED_SOURCE_IP_PORT Option . . . . . . . . . . . . . . . . 10
5. SCOPE Option . . . . . . . . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
7. Security Considerations . . . . . . . . . . . . . . . . . . . 13
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 13
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.1. Normative References . . . . . . . . . . . . . . . . . . . 13
9.2. Informative References . . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13
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