Reposted by Pieter-Jan NefkensSaganism @sagan.bsky.social · 14/08/202641 years ago, Carl Sagan gave a clear and elegant explanation of the science behind global warming. 392142915760
Reposted by Pieter-Jan NefkensTom Hollingsworth @networkingnerd.net · 28/01/2026Guess what's new for 2026? We're streaming live on Youtube! Check out the stream here: www.youtube.com/techfielddayyoutube.comTech Field DayTech Field Day is now part of The Futurum Group. Our events bring together innovative IT product vendors and independent thought leaders to share information and opinions in a presentation and discuss... 053
Pieter-Jan Nefkens @pjnef.bsky.social · 31/12/2025No wonder i have an asthma attack.. the fine dust levels are skyrocketing in my backyard due to fireworks. 040
Pieter-Jan Nefkens @pjnef.bsky.social · 30/12/2025To be honest, with #longcovid & #severeasthma i am not really looking forward to new year’s eve. It will be a day where #pacing and taking rest will be extremely difficult, a crash is to be expected as my available points (cronocarecoach.com ) remain the same but the day is longer. #chronicillnesscronocarecoach.comCrono Care Coach - Energy Management for Chronic ConditionsLiving with a chronic condition means learning to manage limited energy. Crono Care Coach helps you track how you're doing daily. Privacy-first, data stays on your phone 010
Pieter-Jan Nefkens @pjnef.bsky.social · 22/12/2025crono care coach is now live in the apple app store. Register your triggers and activities with points, score & color each day An app (built by someone with longcovid) that helps you with #pacing and #energymanagement. Built for any #chronicillness such as #severeasthma #longcovid #mecfs 000
Pieter-Jan Nefkens @pjnef.bsky.social · 19/12/2025This share from a linkedIn post has a lot of meaning to me. An app that i have been working on for the past years that contains the things that helped me with #longcovid #severeasthma & #pacing is now live in the app store. It helped me getting to where i am today. www.linkedin.com/posts/pieter...linkedin.comTake control of your chronic condition | Pieter-Jan NefkensThe post I am writing today has a lot of meaning to me. I have completed one of my year ambitions and I am incredibly proud of the result. Because Apple has approved the App that I have created, calle... 141
Pieter-Jan Nefkens @pjnef.bsky.social · 16/12/2025I’ve come across plenty, dhcp server, mail, web, database, domain controllers.. all my servers & serving containers have static ipv6 000
Pieter-Jan Nefkens @pjnef.bsky.social · 16/12/2025Oh this is all in the network config and operating servers. No app config . That is all dns 110
Pieter-Jan Nefkens @pjnef.bsky.social · 15/12/2025Though if you enter v6 addresses frequently enough, it will get into your muscle memory.. and use logic numbering for servers. That prefix will become muscle memory. Really 120
Pieter-Jan Nefkens @pjnef.bsky.social · 16/11/2025Agreed. Yet at the same time i must say that google’s focus for ads means that the creditability of google results has dropped significantly. Must say the research option gives good decent results 010
Pieter-Jan Nefkens @pjnef.bsky.social · 29/09/2025It has been almost 3 years since i last saw this view. It will be mine for the coming 8 weeks of #severeasthma rehab in the swiss mountains. 🤞 for a good period to get back up on my feet and refind balance #longcovid 180
Reposted by Pieter-Jan NefkensME/CFS San Diego @mecfssd.bsky.social · 24/06/2025🧬 The largest-ever ME/CFS biological study finds consistent blood abnormalities tied to inflammation, insulin resistance & liver dysfunction—not explained by inactivity. 🔬 Brings us closer to a diagnostic test. 📰 www.ed.ac.uk/news/scale-o... 📄 www.embopress.org/doi/full/10....ed.ac.ukScale of how ME/CFS affects blood revealedPeople with ME/CFS have significant differences in their blood compared with healthy individuals, a new study reveals, suggesting a path towards more reliable diagnosis of the long-term debilitating i... 02910
Reposted by Pieter-Jan NefkensPeter Jones @petergjones.bsky.social · 17/06/2025Hey #CiscoChampion folks, I've started a list for Cisco Champions(current and emeritus) and Champions-adjacent people (e.g., Tech Field Day, Cisco Champions Champions) Ping me if you want to get added. bsky.app/profile/did:... 674
Reposted by Pieter-Jan NefkensJonas Seufert @joseuf.bsky.social · 10/05/2025Mehrere Hundert Menschen bei ME/CFS #Liegenddemo in Leipzig. Betroffene haben Redebeiträge geschrieben, fordern Anerkennung, Unterstützung, Forschung. #longcovid #curemecfs 110330
Reposted by Pieter-Jan NefkensGuus @guusontheinternet.bsky.social · 10/05/2025“Het is nu tijd voor een inhaalslag, voor biomedisch onderzoek, voor meer kennis van zaken. De overheid en universiteiten moeten daarom flink gaan investeren in onderzoek naar PAIS.” #PAIS #MECVS #LongCovid 093
Pieter-Jan Nefkens @pjnef.bsky.social · 06/05/2025This is in line with other dutch research from jan ‘24 that showed that the mitochrondia in the muscle cells (and presumably all cells) do not function properly. 060
Reposted by Pieter-Jan NefkensTom Kindlon @tomkindlon.bsky.social · 06/05/2025Important new research from the Netherlands: Skeletal muscle properties in long COVID and ME/CFS differ from those induced by bed rest www.medrxiv.org/content/10.1... #LongCovid #MEcfs 47132
Reposted by Pieter-Jan NefkensScott Hogg @scotthogg.bsky.social · 24/04/2025Hogg Networking Relaunches and Rebrands with Renewed Emphasis on Providing #IPv6 Training and Consulting Services www.einpresswire.com/article/8059...einpresswire.comHogg Networking Relaunches and Rebrands with Renewed Emphasis on Providing IPv6 Training and Consulting ServicesHogg Networking is proud to announce the re-launching of our company with a focus on providing large enterprises with IPv6 training and technical guidance. 052
Pieter-Jan Nefkens @pjnef.bsky.social · 24/04/2025Living with a chronic illness is tough. Today 3 colleagues threw a retirement party. it was planned months ahead,it allowed me to pal around it and have enough room tomorrow to recover.And then the weather changed, triggering my asthma, so i had to cancel something i was looking forward to. 000
Pieter-Jan Nefkens @pjnef.bsky.social · 17/03/2025So recognizable. We are often really our own worst enemy 010
Reposted by Pieter-Jan NefkensArjantim @arjantim.bsky.social · 11/02/2025The @cisco.com Agile Services Networking looks to simplify the Networking Architecture for the Enterprise, what do think? @techfieldday.com #TFDx #CiscoLiveEMEA 011
Reposted by Pieter-Jan NefkensArjantim @arjantim.bsky.social · 11/02/2025So we're almost going live with the first part of the @techfieldday.com @ciscoliveemea.bsky.social @cisco.com Go beyond is the first slide 🙂 See you live here: techfieldday.com/event/clemea... #CiscoLiveEMEA #TFDxlinkedin.comTech Field Day on LinkedIn: Tech Field Day Extra at Cisco Live EMEA 2025Tech Field Day Extra at Cisco Live EMEA 2025 011
Reposted by Pieter-Jan NefkensTech Field Day @techfieldday.com · 05/02/2025We may only be a few weeks into 2025 but we're ready to bring you more great content! We will once more be broadcasting live from Amsterdam as we kick off Tech Field Day Extra #TFDx at #CiscoLiveEMEA 2025. There are lots of exciting technology announcements that you're not going to want to miss. 072
Pieter-Jan Nefkens @pjnef.bsky.social · 11/02/2025In less then 10 minutes we'll be live with #TFDx at #CiscoLiveEMEA. Thunderbolt launch and directly afterwards Firewalling in the DC Switching, eg Smart Switches. Join us at the livestream: techfieldday.com/event/clemea...techfieldday.comTech Field Day Extra at Cisco Live EMEA 2025 - Tech Field Day 020
Pieter-Jan Nefkens @pjnef.bsky.social · 11/02/2025I am honored to be one of the delegates at TechFieldDay Extra. #TFDx at #CiscoLiveEMEA will start the livestream at 13:00 CET. Join me today on a number of very interesting hashtag#datacenter topics like: #Cisco SmartSwitches & Nexus HyperFabric 010
Pieter-Jan Nefkens @pjnef.bsky.social · 03/02/2025Found a neat trick on iPhone that I just shared: nefkens.net/securing-app...nefkens.netSecuring app access on your iPhone - Pieter-Jan NefkensA short howto explaining how to put an extra layer of protection to any iOS app. 000
Pieter-Jan Nefkens @pjnef.bsky.social · 25/01/2025Finally took the time to write the blog post on #DigitalSovereignty and #SovereignCloud , explaining the term, its concepts and models. nefkens.net/sovereign-cl...nefkens.netDigital Sovereignty/Sovereign cloud explained - Pieter-Jan NefkensDigital sovereignty or sovereign cloud are becoming buzzwords. In this post I'll explain what digital sovereignty and sovereign cloud is about. 010
Pieter-Jan Nefkens @pjnef.bsky.social · 16/01/2025Well it is also a good way to effectively disable that isp forced wifi on 160MHz from ruining your channel plan ;-) 010
Pieter-Jan Nefkens @pjnef.bsky.social · 13/01/2025Honored that i have been invited for @techfieldday.com extra at #CLEUR . Looking forward to learn and write about it 030
Reposted by Pieter-Jan NefkensDaniel Dib @ddib.bsky.social · 13/01/2025Have you heard about #mDNS? It's one of those protocols that go under the radar, but that can really wreak havoc on your network if you don't manage it. While mainly used for consumer stuff, expect to see it in your network. It uses link local multicast so gets flooded at L2. 251
Pieter-Jan Nefkens @pjnef.bsky.social · 04/01/2025And some pics leaving gotheburg.. yesterday evening we saw venus near the moon, dont know which planet this is 000
Pieter-Jan Nefkens @pjnef.bsky.social · 04/01/2025Driving back to the ferry from a winter break resulted in beautiful pictures (and driving with -20 celcius).. 100
Pieter-Jan Nefkens @pjnef.bsky.social · 24/12/2024Happy holidays everyone!media.tenor.comsnoopy is blowing a bell on christmas eve .ALT: snoopy is blowing a bell on christmas eve . 010
Pieter-Jan Nefkens @pjnef.bsky.social · 14/12/2024I’m so much not a happy camper at the moment. Iphone said service of battery, made appointment, heard had to pay whilst apple support app said not (applecare) and spending the afternoon restoring from a wipe that wasnt necessary (and lost all signal chat along the way). Never going back to amac 000
Pieter-Jan Nefkens @pjnef.bsky.social · 13/12/2024Can you provide the rto/rpo times for each application that is run on the infra, so we can determine the rto/rpo for the infra Do you have tco calculations for current infra? Do you know the business cost for 1hr downtime? 010
Pieter-Jan Nefkens @pjnef.bsky.social · 09/12/2024Yet they only function with clear direction which is again clear leadership. And the q to me is if this would also work in managed services (eg existing services) and not only go-and-build-x statements (which is more like create a controlled startup) 000
Reposted by Pieter-Jan NefkensMatt Massicotte @massicotte.org · 30/11/2024Ok, it's time for another one of these "Swift concurrency step-by-step" posts. It explores working with types that are not Sendable. All based around reading a model from some data store. www.massicotte.org/step-by-step...massicotte.orgConcurrency Step-by-Step: Reading from StorageNot too long ago, I was re-reading an “introductory” post I wrote. Honestly, I could barely make it though. I guess a big part of that is that my own defintion of “introduction” when it comes to concu... 79423
Reposted by Pieter-Jan NefkensIPv6 Army @ipv6.army · 29/11/2024Multihoming in #IPv6 is still difficult. blog.ipspace.net/2024/11/ipv6...blog.ipspace.netIPv6 Support for Multiple Routers and Multiple Interfaces « ipSpace.net blogFernando Gont published an Individual Internet Draft (meaning it hasn’t been adopted by any IETF WG yet) describing the Problem Statement about IPv6 Support for Multiple Routers and Multiple Interface... 1124
Pieter-Jan Nefkens @pjnef.bsky.social · 22/11/2024Now that there’s a hobby desk in the living room where i can leave stuuf, i’ve been able to pickup my hobby a bit more. Planking the hull step by step. 000
Pieter-Jan Nefkens @pjnef.bsky.social · 19/11/2024I have a 1gbps up/down fiber connection, running full dualstack #ipv4 and #ipv6 000
Reposted by Pieter-Jan NefkensNick Buraglio @forwardingplane.net · 17/11/2024Shamelessly lifted from someone else #ipv6 1258
Reposted by Pieter-Jan NefkensMacRumors.com @macrumors.bsky.social · 16/11/2024Apple Acknowledges iCloud Notes Disappearing and Explains How to Fixmacrumors.comApple Acknowledges iCloud Notes Disappearing and Explains How to FixEarlier this month, we reported about some iPhone users temporarily losing all of their notes in the Notes app after accepting Apple's updated iCloud terms and conditions. Apple has now indirectly acknowledged this issue in a new support document that… 0657
Pieter-Jan Nefkens @pjnef.bsky.social · 14/11/2024So much for apple solving watchOS 11 battery drain issues. Still happens on 11.1 :-( 000
Pieter-Jan Nefkens @pjnef.bsky.social · 12/11/2024I did a thing! I replaced the strings on my spanish guitar for the first time ever! 070
Pieter-Jan Nefkens @pjnef.bsky.social · 08/11/2024Would this work? www.pyxll.com/docs/introdu...pyxll.comPython in Excel with PyXLL, the Python Excel Add-inRun Python in Excel with PyXLL. Write fully featured, fast, Excel add-ins in Python. 000
Pieter-Jan Nefkens @pjnef.bsky.social · 08/11/2024Postgresql is the oracle database in opensource world (not in cost but jn quality) 110
Pieter-Jan Nefkens @pjnef.bsky.social · 08/11/2024And dont forget the sheer energy consumption that will remove all orgs sustainability achievements of past years. AI is a trendbreaker to getting more energy-efficient datacenters of past decade(s) 120