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Passive Probing for Path MTU Discovery with QUIC

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft whose latest revision state is "Expired".
Expired & archived
Author Pyung Soo Kim
Last updated 2023-01-07 (Latest revision 2022-07-06)
RFC stream (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This draft consider an alternative PMTUD for QUIC. To discover the best PMTU, the passive probing approach is adopted. The process of discovering the best PMTU is not carried out separately, but is carried out simultaneously in the actual application data communication. A probe packet is defined newly using 1-RTT packet which includes actual application data as well as a short packet header and a PING_EXT frame. The PING_EXT frame is also defined newly. Until the best PMTU is discovered, the size of the probe packet is changed according to the size of the PMTU candidate. A simple discovery algorithm using only the PMTU candidate sequence with linear upward is described in this draft. Other rather complex discovery algorithms that consider various PMTU candidate sequences will be dealt with in the future.


Pyung Soo Kim

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