Abstract. Intrinsic Monitoring is a method of collecting and disseminating node specific monitoring data throughout an IPv6 network by using the IPv6 extension headers as a carrier medium. The advantages of such a monitoring mechanism can be invaluable to a network operator, offering a wide range of performance and accuracy enhancements over traditional SNMP based or active probing based approaches. This paper discusses previous proposals related to Intrinsic Monitoring and highlights a number of security considerations that must first be resolved for such an approach to be deployable within an operational IP network. The paper offers initial contributions towards addressing these challenges.