In the simple multipath option draft, I wrote a short mention of the issue with computing round trip times when packets and acknowledgements can travel on multiple paths (section 5.3 of https://datatracker.ietf.org/doc/draft-huitema-quic-mpath-option/). I just wrote a short blog to elaborate on this: https://huitema.wordpress.com/2021/09/19/one-way-delays-for-multipath-quic/

-- Christian Huitema

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