RFC 2521 · EXPERIMENTAL · 1999 TUE · 15 SEP 2026

ICMP Security Failures Messages

By P. Karn, W. Simpson · Published March 1999 · DOI 10.17487/RFC2521

Overview

RFC 2521, “ICMP Security Failures Messages”, is an Experimental document published in March 1999 by P. Karn, W. Simpson. The canonical text is published by the RFC Editor.

Abstract

This document specifies ICMP messages for indicating failures when using IP Security Protocols (AH and ESP). This document defines an Experimental Protocol for the Internet community.

Abstract as published in the RFC, via rfc-editor.org.

What “Experimental” means

Describes a specification that is part of a research or development effort, published so the community can gain experience with it.

Read this RFC

The canonical text of RFC 2521 is hosted at rfc-editor.org. Available in TXT,HTML.

Read on rfc-editor.org Plain text › HTML › IETF Datatracker › DOI link ›
Other RFCs from 1999