Joe, RFC3819, Section 2 in particular gives BCPs for setting link MTUs. By my read, the only links that would set an MTU smaller than 576 should therefore only occur at the network edges; not somewhere in the middle of the network. And, any NATs that connect edge networks would have Internet-facing interface MTUs of 576 or larger.
So, the only bad case really is for a source located behind a link with an MTU smaller than 576, with the resulting fragments then going to the first-hop NAT, and that NAT *does not* reassemble before forwarding to the Internet. Do you know of any NATs that are like that? BTW, working in the aviation and defense industries I know of some pretty low-end links and I'm sure you do too. Fred _______________________________________________ Int-area mailing list Int-area@ietf.org https://www.ietf.org/mailman/listinfo/int-area
