We can actually do MTU discovery one better here. Figure we know the
MTU for each tunnel in the system (move that information around with
the rest of the measurement data, and we won't even notice the
overhead), so the first hop knows the path MTU when it computes the
route, and can drop too-large packets immediately, so that the MTU
discovery cost is just the local RTT rather than half the wide-area
RTT.
Andy
-- //------------------------------------------------------------------------- // Andy Collins -- KC6YEY acollins@cs.washington.edu // Graduate Student, University of Washington // Haldane's Law: // The Universe is not only queerer than we imagine, it is queerer than we // CAN imagine. // (collection last updated by Don Woods) //-------------------------------------------------------------------------