Mark Smith; >>>A number of commercial >>>products and applications do rely on PMTU to work, and will >>>do an PATH MTU discovery, and send the MTU sized packets with >>>DF (don't frag). >> >>and send packets larger than MTU expecting to receive ICMP >>errors in vain. >> >>Read the original mail of the thread on the reality. > The problem identified has nothing to do with the concept or > typical implementations of PMTUD being broken. Wrong. > RFC1192 (http://www.rfc-editor.org/rfc/rfc1191.txt) is the spec > for PMTUD. Read the RFC. It says "To detect increases in a path's PMTU, a host periodically increases its assumed PMTU". Masataka Ohta _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf