On 3/15/2017 9:33 AM, Leddy, John wrote: > Does this mean that only middle boxes, not covered by the architecture could insert an extension header for use within the domain? Please see my recent post about Stefano's issue. IMO, any opaque (distributed) system that acts like a host can follow the host (node) requirements. The instant that system is not opaque or fails to act like a single host, it becomes noncompliant. Joe