Comment on resynchronization of connection status proposal
RFC 489, “Comment on resynchronization of connection status proposal”, is an Unknown document published in March 1973 by J. Postel. The canonical text is published by the RFC Editor.
What “Unknown” means
The standards-track status of this early RFC was never formally classified.
The canonical text of RFC 489 is hosted at rfc-editor.org. Available in TXT,HTML.