Port Management to Reduce Logging in Large-Scale NATs (RFC7768)
Original Publication Date: 2016-Jan-01
Included in the Prior Art Database: 2016-Feb-09
Internet Society Requests For Comment (RFCs)
T. Tsou: AUTHOR [+4]
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.
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 http://www.rfc-editor.org/info/rfc7768.
Tsou, et al. Informational [Page 1]
RFC 7768 NATx4 Log Reduction January 2016
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