It's also possible for DCCP to get a better initial estimate of the PMTU,
and apparently there are other problems with the current DCCP PMTUD
mechanism (using ICMP can't fragment messages).
Yes -- The current draft tries to make clear (but fails to) that a new,
PLPMTUD-style MTU discovery
A packetization layer should set an ECN codepoint in
the packets it sends IFF it is also doing Packetization
Layer Path MTU Discovery (PLPMTUD) and is not
expecting to get ICMP's back from the network in
response to too-large packets being dropped.
Why overload the ECN bit this
