Port Control Protocol (PCP) Proxy Function
RFC 7648
| Document | Type |
RFC - Proposed Standard
(September 2015; No errata)
Was draft-ietf-pcp-proxy (pcp WG)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-bpw-pcp-proxy | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Dave Thaler | ||
| Shepherd write-up | Show (last changed 2015-05-29) | ||
| IESG | IESG state | RFC 7648 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Brian Haberman | ||
| Send notices to | (None) | ||
| IANA | IANA review state | IANA OK - No Actions Needed | |
| IANA action state | No IC | ||
Internet Engineering Task Force (IETF) S. Perreault
Request for Comments: 7648 Jive Communications
Category: Standards Track M. Boucadair
ISSN: 2070-1721 France Telecom
R. Penno
D. Wing
Cisco
S. Cheshire
Apple
September 2015
Port Control Protocol (PCP) Proxy Function
Abstract
This document specifies a new Port Control Protocol (PCP) functional
element: the PCP proxy. The PCP proxy relays PCP requests received
from PCP clients to upstream PCP server(s). A typical deployment
usage of this function is to help establish successful PCP
communications for PCP clients that cannot be configured with the
address of a PCP server located more than one hop away.
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 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7648.
Perreault, et al. Standards Track [Page 1]
RFC 7648 PCP Proxy September 2015
Copyright Notice
Copyright (c) 2015 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
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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Use Case: The NAT Cascade . . . . . . . . . . . . . . . . 4
1.2. Use Case: The PCP Relay . . . . . . . . . . . . . . . . . 5
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Operation of the PCP Proxy . . . . . . . . . . . . . . . . . 6
3.1. Optimized Hairpin Routing . . . . . . . . . . . . . . . . 8
3.2. Termination of Recursion . . . . . . . . . . . . . . . . 9
3.3. Source Address for PCP Requests Sent Upstream . . . . . . 10
3.4. Unknown Opcodes and Options . . . . . . . . . . . . . . . 10
3.4.1. No NAT Is Co-located with the PCP Proxy . . . . . . . 10
3.4.2. PCP Proxy Co-located with a NAT Function . . . . . . 10
3.5. Mapping Repair . . . . . . . . . . . . . . . . . . . . . 11
3.6. Multiple PCP Servers . . . . . . . . . . . . . . . . . . 11
4. Security Considerations . . . . . . . . . . . . . . . . . . . 12
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1. Normative References . . . . . . . . . . . . . . . . . . 12
5.2. Informative References . . . . . . . . . . . . . . . . . 13
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
Perreault, et al. Standards Track [Page 2]
RFC 7648 PCP Proxy September 2015
1. Introduction
This document defines a new Port Control Protocol (PCP) [RFC6887]
functional element: the PCP proxy. As shown in Figure 1, the
PCP proxy is logically equivalent to a PCP client back-to-back with a
PCP server. The "glue" between the two is what is specified in this
document. Other than that "glue", the server and the client behave
exactly like their regular counterparts.
The PCP proxy is responsible for relaying PCP messages received from
PCP clients to upstream PCP servers and vice versa.
Whether or not the PCP proxy is co-located with a flow-aware function
(e.g., NAT, firewall) is deployment specific.
.................
+------+ : +------+------+ : +------+
|Client|-------:-|Server|Client|-:----|Server|
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