Hi, Stewart, On 4/24/2017 10:12 AM, Stewart Bryant wrote: > Minor issues: > > A node MUST NOT reduce its estimate of the Path MTU below the IPv6 > minimum link MTU. > > SB> I missed this last time. > SB> > SB> Presumably you mean "A node MUST NOT reduce its estimate of the > SB> Path MTU below the IPv6 minimum link MTU in response to such > SB> a message." This seems fine to me, FWIW - i.e., limiting the advice in this doc to the mechanism in this doc. > SB> > SB> Otherwise I would have thought that this was entirely a matter > SB> for the host whether it wanted to use a Path MTU below the IPv6 > SB> link minimum. Nothing breaks if the host takes a more conservative > SB> decision. I don't agree; the host at that point is violating RFC2460. It should never think that an IPv6 link or path with an MTU below what RFC2460 requires is valid. Joe