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moxygen

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fb.mvfst.net:9448/moq-relay

Sweep of 2026-11-10 01:29 UTC Latest report JSON

Identifies itself as
Meta MoQ C++ Draft-14
Measured
2026-11-10 01:29 UTC
Measured from
Helsinki, Finland
Probe
moqtap-probe 0.7.0 (ee97a7ac6179)
Drafts negotiated
drafts 14, 16, 18, 22
Drafts the operator lists
drafts 16, 18, 22
QUIC WT IPv4

A deployment of Moxygen, operated by Meta. About this endpoint

At a glance

Protocols accepted
moq-00, h3, moqt-16, moqt-18, moqt-22
Media delivery
delivered
Violations recorded
1

Certificate

Subject
CN=fb.mvfst.net
Issuer
C=US, O=Let's Encrypt, CN=YE1
Valid until
2026-12-24 45 days left when measured
Trust
Publicly trusted
Verification
Completed with the certificate verified

Control messages

What each request got back, per draft. ok and err are both answers; ✗ is a request refused or left unanswered; a dash is a request our side did not complete. Times run from the request to its answer; each request waited up to 3,000 ms.

Draft SUBSCRIBEFETCHTRACK_STATUSSUBSCRIBE_NAMESPACEPUBLISH_NAMESPACESUBSCRIBE_TRACKSPUBLISH
22 QUIC ✓ err 117 ms ✓ err 117 ms ✓ err 117 ms ✓ ok 117 ms ✓ ok 117 ms ✓ ok 118 ms ✓ ok 117 ms
18 QUIC ✓ err 130 ms ✓ err 130 ms ✓ err 130 ms ✓ ok 130 ms ✓ ok 130 ms ✓ ok 130 ms ✓ ok 130 ms
16 QUIC ✓ err 119 ms ✓ err 118 ms ✓ err 118 ms ✓ ok 118 ms ✓ ok 118 ms · ✓ ok 118 ms
14 QUIC ✓ err 115 ms ✓ err 115 ms ✓ err 116 ms ✓ ok 115 ms ✓ ok 115 ms · ✓ ok 115 ms
  • SUBSCRIBE · drafts 16, 18, 22 · QUIC REQUEST_ERROR 16 “no such namespace or track”.
  • SUBSCRIBE · draft 14 · QUIC SUBSCRIBE_ERROR 16 “no such namespace or track”.
  • FETCH · drafts 16, 18, 22 · QUIC REQUEST_ERROR 16 “no upstream for fetch”.
  • FETCH · draft 14 · QUIC FETCH_ERROR 16 “no upstream for fetch”.
  • TRACK_STATUS · drafts 16, 18, 22 · QUIC REQUEST_ERROR 16 “no such namespace or track”.
  • TRACK_STATUS · draft 14 · QUIC TRACK_STATUS_ERROR 16 “no such namespace or track”.

Media delivery

One publisher and two subscribers, to see whether an object published through this endpoint reaches a client that asked for it.

Object delivered end to end draft 22 · QUIC
Objects delivered
7/7
Groups / subgroups
2 / 3
Subscribe answered
247ms
First object
117ms
Stream framing
streams kept as sent
Second subscriber
Same object delivered to a second subscriber
Offers a track
relay offered nothing

Two publishers of one track

Two publishers announce the same namespace and publish the same tracks, one with identical payloads and one with payloads that differ by publisher. Partway through, the publisher serving the subscribers disconnects without notice. A fresh subscription, sent afterwards, shows whether the remaining publisher could still be reached.

Measured draft 22 · QUIC
Publisher Role Announcement Subscribed to Ended by the relay
first publisher cancelled The relay accepted it, then withdrew its namespace. accepted, REQUEST_OK in 131 ms — Namespace withdrawn: stream reset (code 1)
second publisher disconnected serving The relay accepted it and subscribed to it. accepted, REQUEST_OK in 123 ms differing payloads, identical payloads —
Track Objects From When the publisher left Ended by
identical payloads each object once 15 delivered — ended by the relay PUBLISH_DONE 4294967295 “closed locally”
differing payloads each object once 15 delivered second publisher ended by the relay PUBLISH_DONE 4294967295 “closed locally”

A fresh subscription after the publisher left: refused with REQUEST_ERROR 16 “no such namespace or track”.

Specification violations

One Track Alias must not be used for two tracks at once. duplicate_track_alias

Draft 22 over QUIC, during the delivery run, asking the relay to offer a track

Specification
draft-ietf-moq-transport-22, Section 3.1.3
“The same Track Alias MUST NOT be used by a publisher to refer to two different Tracks simultaneously in the same session. If a subscriber receives a PUBLISH or SUBSCRIBE_OK that uses the same Track Alias as a different Track with an Established subscription, it MUST close the session with error DUPLICATE_TRACK_ALIAS.”
Required response
close the session with DUPLICATE_TRACK_ALIAS (0x5)

Setup parameters

What this endpoint sent back in its setup response, per draft. A parameter with no name is a code point the negotiated draft does not define.

draft 22 · QUIC

  • 0x07 moqt_implementation = Meta MoQ C++ Draft-14

draft 18 · QUIC

  • 0x07 moqt_implementation = Meta MoQ C++ Draft-14

draft 16 · QUIC

  • 0x02 max_request_id = 100
  • 0x04 max_auth_token_cache_size = 1024
  • 0x07 moqt_implementation = Meta MoQ C++ Draft-14

draft 14 · QUIC

  • 0x02 max_request_id = 100
  • 0x04 max_auth_token_cache_size = 1024
  • 0x07 not defined by this draft = Meta MoQ C++ Draft-14 (moqt_implementation in 15–23)

Measured by sweep

SweepProbeReachableDraftsRequests answeredDeliveryOffers a trackCertificate valid untilViolationsTwo publishers
10 Nov 20260.7.0 ee97a7ac6179yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
9 Nov 20260.7.0 ee97a7ac6179yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
8 Nov 20260.7.0 ee97a7ac6179yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
7 Nov 20260.7.0 ee97a7ac6179yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
6 Nov 20260.7.0 ee97a7ac6179yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
5 Nov 20260.7.0 ee97a7ac6179yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
4 Nov 20260.7.0 0da3083d8bdeyesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
3 Nov 20260.7.0 fcd05c5302c4yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
2 Nov 20260.7.0 fcd05c5302c4yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
1 Nov 20260.7.0 fcd05c5302c4yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
31 Oct 20260.7.0 fcd05c5302c4yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
30 Oct 20260.7.0 fcd05c5302c4yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
29 Oct 20260.7.0 632a80524083yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUICrelay offered nothing2026-12-24duplicate_track_alias 22 QUICno defects
27 Oct 20260.5.0 74c287bac814yesdrafts 14, 16, 18, 2222 QUIC: 7 of 718 QUIC: 7 of 716 QUIC: 6 of 614 QUIC: 6 of 6Object delivered end to end22 QUIC—2026-12-24——

Notes

  • — The endpoint is up and refused the offered protocols on at least one transport.

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