Well, now I feel stupid. I finally figured out why, since upgrading to Debian 13/trixie, there are some websites I couldn't connect to, but only over IPv6, they work fine on their IPv4 address.

Fucking MTU.

I'd for a long time had an IPv4 iptables rule to force the MSS (maximum segment size) on outbound packets to `1400`. But I never put in an equivalent for IPv6.

I use 'jumbo packets' on the LAN between desktop and server, which means an MTU of 4088 (for that pair of NICs). So anything forwarded out was using an MSS of 4088 as well.

The issue only showed up for *some* sites, and only for IPv6, and only on 13/trixie because:

1. 13/trixie uses openssl 3.x, not the older version, which has slightly different cipher suites etc in the default config.
2. IPv6 addressing makes packets that little bit bigger.
3. I've only ever observed the issue with MS Azure/Edge hosts.

What was happening was that the first part of the "Server Hello" after a "Change Cipher Spec, Client Hello" from my end was being lost, as the TCP level packet was too large and fragmented... but the first fragment was too large for my PPP link.

So, added an ip6tables rule to do the set-mss thing as well, and now it works.

#Linux #IPv6 #MTU #MSS #openssl #msedge #azure

Мониторинг и управление качеством мобильного интернета на микротике

Мониторинг и управление качеством мобильного интернета на Mikrotik В данной статье автор делится своим опытом мониторинга и повышения качества мобильного интернета для частного дома в условиях слабого и плохого мобильного сигнала на роутерах микротик. Статья будет полезна тем, кто интересуется микротиками и сетевыми технологиями, программирует микротики. Интересно ->

https://habr.com/ru/articles/990498/

#mikrotik #routeros #мобильный_интернет #LTEмодем #LTEроутер #QoS #MSS #мониторинг_качества_интернета #управление_качеством_связи

Industrial disputes & news - 21 January 2026
Vic public sector healthcare workers; #Sealife; #Qantas; #Carnival; #CrownCasino; #DownerEDI; #Zinfra; #TasRail; #HarryHartog & #BerkelouwBooks; #LakeImaging; #Thales; #MSS; #AmbulanceVictoria; #CSR & more

(Thanks Sarah Missen)

https://open.substack.com/pub/disputesreport/p/industrial-disputes-and-news-21-january?

#LabourMovement #Organize #Solidarity #Strikes #unions

Industrial disputes & news - 17 December 2025
SA public sector workers; Tassie #teachers; Harry Hartog & Berkelouw Books; #KeolisDowner; SA #nurses & #midwives; #AmbulanceVictoria; #FreoCranes; #MSS; #Bechtel; #Healthscope; #VAHPA; #DHLExpress & more

(Thanks Sarah Missen)
https://disputesreport.substack.com/p/industrial-disputes-and-news-17-december

#LabourMovement #Organize #solidarity #Strikes #Unions

Tác giả tạo bộ thành phần & mẫu thiết kế **Next.js** miễn phí, tập trung vào hiệu quả công việc. Bao gồm: mẫu giao diện hoàn chỉnh, khối động, thành phần động (nút, preloader). Sử dụng: **Next.js**, **Tailwind CSS**, **Framer Motion**, **GSAP**. Mời góp ý để cải thiện. #Nextjs #TailwindCSS #FramerMotion #GSAP #MSS #ThiếtKếWeb #CSS #JS #FreeTool

https://www.reddit.com/r/SideProject/comments/1po0u2l/i_built_a_set_of_free_nextjs_components_and/

Advanced Market Structure Shift (MSS) & Change of Character (ChoCH) pada Trading Kripto

#Tradingan - Advanced #Market Structure Shift (#MSS) & #Change of Character (#ChoCH) pada #Trading #Kripto - Dalam #pasar kripto yang sangat dinamis, membaca arah pergerakan harga secara akurat menjadi tantangan besar bagi trader. Banyak trader bergantung pada indikator #teknikal standar seperti #Moving Average, #RSI, dan #MACD. Namun, indikator visual tersebut sering terlambat…

https://tradingan.com/advanced-market-structure-shift-mss-change-of-character-choch-pada-trading-kripto

incredible explanation of bots from the head of product over at #X, the everything app

my take is that the #FSB / #MSS / #crypto pumpers / etc. know exactly how to get the tards riled up

#socialmedia #bots #christiannationalism #nikitaBier #MAGA #uspol #uspolitics