RFC 7422

Deterministic Address Mapping to Reduce Logging in Carrier-Grade NAT Deployments, December 2014

Canonical URL:
https://www.rfc-editor.org/rfc/rfc7422.txt
File formats:
Plain TextPDF
Status:
INFORMATIONAL
Authors:
C. Donley
C. Grundemann
V. Sarawat
K. Sundaresan
O. Vautrin
Stream:
INDEPENDENT

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC7422

Discuss this RFC: Send questions or comments to rfc-ise@rfc-editor.org

Other actions: Find Errata (if any)  |  Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

In some instances, Service Providers (SPs) have a legal logging requirement to be able to map a subscriber's inside address with the address used on the public Internet (e.g., for abuse response). Unfortunately, many logging solutions for Carrier-Grade NATs (CGNs) require active logging of dynamic translations. CGN port assignments are often per connection, but they could optionally use port ranges. Research indicates that per-connection logging is not scalable in many residential broadband services. This document suggests a way to manage CGN translations in such a way as to significantly reduce the amount of logging required while providing traceability for abuse response. IPv6 is, of course, the preferred solution. While deployment is in progress, SPs are forced by business imperatives to maintain support for IPv4. This note addresses the IPv4 part of the network when a CGN solution is in use.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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