I have gigabit fiber (up and down) out in rural #Kansas. I remain very thankful for the end to decades of dealing with weird antennas and such.
But today they switched from raw #Ethernet to #PPPoE, and although performance hasn't suffered to a noticeable extent, my #MTU has gone from 1500 to 1492. I am probably irrationally annoyed at this.
But dammit, PPP? In 2025? And going backwards on packet size?
S I G H.
There’s always another 🕳️ to go down. Now it’s a packet-level analysis of raw L2TPv3 pseudowires vs UDP encapsulated ones to find out •why• the raw ones come in with a lower automatic MTU than the UDP ones do. On the surface, this makes no sense. #NetEng #Labbing #L2TP #MTU #TunnelsAllTheWayDown
Triebwerksbauer MTU hebt nach gutem Quartal Jahresziele an https://www.diebayern.de/wirtschaft/triebwerksbauer-mtu-hebt-nach-gutem-quartal-jahresziele-an-3067090?utm_source=Mastodon&utm_medium=dpa&utm_content=textlink #Industrie #MTU #Deutschland #Flugzeugbau #Triebwerksbauer #München
¡Conoce el MTU! 🗣️ Te explicamos qué es el Monto Límite Bancario, cómo funciona y cuáles son los cambios que se implementarán a partir del 1 de octubre. Infórmate sobre esta noticia en el artículo. #MTU #Bancos #Noticias #FinanzasPersonales
Infórmate: https://zurl.co/fQtWx
¡Tus finanzas cambian! ✍️ El MTU (Monto Límite Bancario) tendrá modificaciones desde el 1 de octubre. Entérate de lo que hay detrás de esta regulación y cómo te afecta en el artículo. #MTU #Banca #Noticias #Economía
Lee la nota: https://zurl.co/pRLN7
¡Alerta financiera! 🚨 ¿Qué es el MTU o Monto Límite Bancario? Te explicamos cómo funciona y los cambios que entran en vigor a partir del 1 de octubre. Conoce los detalles en la nota. #MTU #Bancos #Finanzas #México
Más aquí: https://zurl.co/iom1z
Yesterday's links:
One more planet
https://polyhedralnonsense.com/2025/09/03/building-a-galaxy-9-nevron-the-sea-dogs/
New magic item: gloves of transmuting
https://seaofstarsrpg.wordpress.com/2025/09/02/tuesday-magic-item-gloves-of-transmuting/
Dollguard
https://occultronics.blogspot.com/2025/09/dollguard-arise-ye-wretched.html
New magic item: leper's veil
https://ancientvaults.wordpress.com/2025/09/03/new-magic-item-lepers-veil/
Byakhee for old school fantasy
https://shutteredroom.blogspot.com/2025/09/not-quite-canon-byakhee-for-old-school.html
Cozy witching campaign part 2
https://deathtrap-games.blogspot.com/2025/09/the-journal-of-agatha-fizzyflask-my.html
These Deep Halls
https://www.donjonlands.com/2021/03/these-deep-halls-or-where-to-start/
@dentangle @evey @Natanox or more specifically an #IPv6 #MTU issue... "sudo ip6tables -I OUTPUT -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1350" fixes it...
will need to add this site to my IPv6 MTU test script (https://github.com/T-X/ipv6-path-mtu-discovery-verifier).
Und über @FreifunkHamburg sollte es an sich (theoretisch) dann auch keine #MTU Probleme geben können, weil wir hier im Gegensatz zur getunnelten Lösung über @freifunkMUC oder über HE die vollen 1500 bytes haben.
So for the #IPv6 #MTU issues we seemed to stumble over at @ffhl, with our asymmetric #BGP routes to/from @FreifunkHamburg / @freifunkMUC I now wrote a small bash script to test a list of websites with varying, asymmetric MTUs: https://github.com/T-X/ipv6-path-mtu-discovery-verifier/. There is a suspicious amount of #Microsoft websites for the failed tests at the bottom.
Next steps would be to add analyzing of #tcpdump captures. But in a few samples it seemed like those sites did not receive / react to our #ICMPv6 Packet Too Big
Fun Stuff: My new #internet connection does not work with #MicrosoftTeams videocalls. Sounds like a feature, but job-wise it's a bit impractical.
Some debugging showed that for just the api-emea.flightproxy.teams.microsoft.com host on v6 regular ping works, ping with bigger payload gets dropped. Every other host I tested has correctly working #MTU on v6 and v4. Connection on v4 it works fine.
What the actual... Any #network people seen this before? Bad peering at my new ISP?
#IPv6 (zumindest via #radvd) ist bei uns nun temporär deaktiviert wegen #MTU Problemen, scheinbar zu diversen #Microsoft Seiten/Diensten. Dies macht sich dadurch bemerkbar, dass insbesondere größere Dateien/Seiteninhalte hier nicht geladen werden. Zur Zeit sieht es für uns aus, als ob sich #Microsoft nicht an IPv6-Standards hält (und insbesondere ICMPv6 Packet Too Big Nachrichten unkorrekterweise ignoriert). Aber wir sind da dran, das zu klären.
Jetzt nur über IPv4 sollte es aber vorerst gehen.
L'italien Avio Aero s'associe au français Safran et à l'allemand MTU Aero Engines pour motoriser la prochaine génération d’hélicoptères militaires européens. Leur objectif est d'être en ordre de marche pour répondre conjointement, en octobre 2025, à un appel d’offres du Fonds européen de la défense pour un moteur d’hélicoptère lourd de nouvelle génération. #SAFRAN #AVIOAERO #MTU #PAS25
At @ffhl we have asymmetric #IPv6 routes, too: @ffhl -> @FreifunkHamburg -> ... -> #Microsoft. And: #Microsoft -> ... -> @freifunkMUC -> <1480 #MTU #GRE tunnel> -> @ffhl.
With network namespaces I recreated the asymmetric routes with differing MTUs on my laptop behind a DSL. I see my virtual router on my laptop send ICMPv6 Packet Too Big packets. But Microsoft keeps sending too big packets. So with that I seem to be able to recreate the issue without the Freifunk context.
