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Port Management to Reduce Logging in Large-Scale NATs (RFC7768) Disclosure Number: IPCOM000245110D
Original Publication Date: 2016-Jan-01
Included in the Prior Art Database: 2016-Feb-09
Document File: 22 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

T. Tsou: AUTHOR [+3]


During the IPv6 transition period, some large-scale NAT devices may be introduced, e.g., Dual-Stack Lite (DS-Lite), Address Family Transition Router (AFTR), and NAT64. When a NAT device needs to set up a new connection for a given internal address behind the NAT, it needs to create a new mapping entry for the new connection, which will contain source IP address, source port or ICMP identifier, converted source IP address, converted source port, protocol (TCP/ UDP), etc.

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Independent Submission                                           T. Tsou Request for Comments: 7768                              Philips Lighting Category: Informational                                            W. Li ISSN: 2070-1721                                            China Telecom                                                                T. Taylor                                                                 J. Huang                                                      Huawei Technologies                                                             January 2016

          Port Management to Reduce Logging in Large-Scale NATs


   Various IPv6 transition strategies require the introduction of large-    scale NATs (e.g., AFTR and NAT64) to share the limited supply of IPv4    addresses available in the network until transition is complete.    There has recently been debate over how to manage the sharing of    ports between different subscribers sharing the same IPv4 address.    One factor in the discussion is the operational requirement to log    the assignment of transport addresses to subscribers.  It has been    argued that dynamic assignment of individual ports between    subscribers requires the generation of an excessive volume of logs.    This document suggests a way to achieve dynamic port sharing while    keeping log volumes low.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   This is a contribution to the RFC Series, independently of any other    RFC stream.  The RFC Editor has chosen to publish this document at    its discretion and makes no statement about its value for    implementation or deployment.  Documents approved for publication by    the RFC Editor are not a candidate for any level of Internet    Standard; see 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

 Tsou, et al.                  Informational                     [Page 1]
 RFC 7768                   NATx4 Log Reduction              January 2016

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