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Re: Problem of blocking ICMP packets

2004-05-10 12:04:18
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



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