Packetization Layer Path MTU Discovery (plpmtud) Concluded WG

Note: The data for concluded WGs is occasionally incorrect.

WG Name Packetization Layer Path MTU Discovery
Acronym plpmtud
Area Transport Area (tsv)
State Concluded
Charter charter-ietf-plpmtud-01 Approved
Dependencies Document dependency graph (SVG)
Personnel Chair Matt Mathis

Charter for Working Group

This BOF is to introduce a new "Packetization Layer Path MTU Discovery
Algorithm" and discuss IETF venues that might be used to complete the

This new algorithm does not rely on ICMP or other messages from the
network (so it is not subject to the problems described in RFC2923).
Instead it finds the proper MTU by starting with relatively small
packets and searching upwards by probing with test packets.

Key portions of the algorithm need to be implemented in the transport
layer. In particular any lost probes should not be treated as
signals. For this reason, it can be argued that this work belongs in
TSV area.

Many of the unresolved design issues pertain to the efficient use of
shared state between concurrent and successive connections to the same
destination. The complexities of the this aspect of the algorithm are
due to the huge technological breadth and subtleties of the delivery
semantics associated with the network and lower layers. For this
reason, it can be argued that this work belongs in the INT area.


Date Milestone