As i know, PMTUD uses ICMPv6 to find minimum MTU value in the network path. I understood why IPv6 doesn't allow fragmentation (by reading this article), but PMTUD doesn't look like good manner.
here are my thoughts.
- it has to find the network path from src to dst to get min MTU value. i think this is additional delay.
- when path is changed due to inter-router failure or something else, it has to repeat 1. process which increases delay again.
am i thinking wrong? any comments is my pleasure. thanks.