> > Disagree - PMTU probing is a unidirectional endeavor since the path > > from A->B may have completely different characteristics than B->A. > > But this isn't on a path, it's on the same L2. L2 traditionally is a > spanning tree, or broadcast media so the assumption seems to hold.
When a tunnel is used, there may be many L2 segments (connected by L2 switches) with diverse MTUs separating the tunnel endpoints in what otherwise appears as a single-hop to L3. And, the set of L2 segments will often be different in the forward and reverse directions. I asked this earlier, but where are we at in the decision process for native IPv6 vs tunneled? Fred [EMAIL PROTECTED] -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
