Syslog Format for NAT Logging

Document Type Replaced Internet-Draft (individual)
Last updated 2013-03-04 (latest revision 2012-09-06)
Replaced by draft-ietf-behave-syslog-nat-logging
Stream ISE
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Stream ISE state No Longer In Independent Submission Stream
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IESG IESG state Replaced by draft-ietf-behave-syslog-nat-logging
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Under some circumstances operators will need to maintain a dynamic record of external address and port assignments made by a Carrier Grade NAT (CGN), and will find it feasible and convenient to create such records using SYSLOG (RFC 5424). The present document standardizes a SYSLOG format to meet that recording requirement. It specifies a number of fields that could be a part of the log report, leaving it up to operators to select the fields needed for their specific circumstances. [*** Subject to discussion*** The log format presented here may also be used by PCP server implementations to log the mappings they implement.]


Zhonghua Chen (
Cathy Zhou (
Tina Tsou (
Tom Taylor (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)