just to get down a level from meta- > If the right answer is to allow packet modifications that break PMTUD > and IPsec/AH, let's do it, but let's also say we're doing it. obvious imiho > I happen to think it's the wrong answer, but that's my problem. i share it, but this is at the border of my expertise. i have this fantasy of pmtu actually working before i retire. i realize it is unrealistic. > Leaving the text open to interpretation would make a mockery of > promoting it to Standard. agree. but v6 specs seem to like wussing out and leaving the opportunity to do wrong things. i'll bet you a reuben at the corned beef factory in chicago that the next try at the addressing architecture still does not *unambiguously* state cidr except for slaac. randy