ICMP Extensions for Environmental Information

This document defines a data structure that can be appended to selected ICMP messages. The ICMP extension defined herein can be used to gain visibility on environmental information on the internet by providing per-hop (i.e., per topological network node) power metrics and other present or future metrics around environmental information. This will contribute to achieving an objective mentioned in the IAB E-Impact workshop [RFC9547]. The techniques presented are useful not only in a transactional setting (e.g., a user-issued traceroute or a ping request), but also in a scheduled automated setting where they may be run periodically in a mesh across an administrative domain to map out environmental information.