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SwiNOG #41 Recap – Full House on the Gurten, Switzerland
by Steven Glogger 01 May '26

01 May '26

Hi all, SwiNOG #41, held on April 28, 2026, on Bern’s Gurten, once again demonstrated what makes the Swiss Network Operators Group special: strong technical content, an engaged community, and a format that simply works. This edition saw exceptionally high demand — for the first time, we had to introduce a waiting list. Out of 180 available seats, 169 participants joined on the day, reflecting a consistently strong show rate and the commitment of the community. Technical depth that matters The agenda covered a wide range of real-world challenges and forward-looking topics. From optical transport insights — such as analysing transceiver efficiency using VDM metrics — to practical approaches in network automation, observability, Agentic Network Operations: What AI Can (and Can’t) Do in and infrastructure resilience, the talks stayed close to what operators actually deal with day-to-day. What stood out again was the balance: no buzzword bingo, no vendor fluff — just technical talks, shared experiences, and things you can actually take back and apply. Talks * Rethinking Network Strategy & Building Resilience Through PNIs, Peering and Smart Geographical Expansion – Wouter Van Renterghem (RETN GmbH) * bgproutes.io: A Next-Gen BGP Data Collection Platform – Thomas Holterbach (University of Strasbourg) * Understanding and Optimising Transceiver Power Consumption Using Internal Metrics – Gerhard Stein (Flexoptix GmbH) * Shared Spectrum & MOFN – Liam Taylor (EXA Infrastructure) * 25 Years of SwissIX – A Quarter Century of Peering – Arist Volger (SwissIX) * SwissIX Update – Arist Volger (SwissIX) * Toward Agentic Network Operations: What AI Can (and Can’t) Do – Tobias Bühler (netfabric.ai) * An Introduction to ASPA – Validating AS-Paths with the help of RPKI - Massimiliano Stucchi (SwiNOG) * EVPN Unleashed: Scaling Multi-Domain Fabrics with EVPN Gateways – Remi Locherer (modus one / Arista) * SCION Inter-Domain Routing – Tilmann Zäschke (ETH Zürich) * The Network Automation Map: Navigate Your Journey with NAF – Damien Garros (OpsMill) * Building a Vendor-Agnostic E2E Testing Ecosystem with Netlab – Leandro Lerena & Andy Griesbeck (Zebbra AG) * Introduction to CHNUG – Severin Dellsperger (OST University) * Closing Remarks – Simon Ryf & Steven Glogger (SwiNOG) Resources are online As always, all presentations and videos are available online: 👉 https://www.swinog.ch/meetings/swinog41/ This ensures the content lives beyond the event and remains accessible to the broader community. Looking ahead SwiNOG continues to grow — not just in numbers, but in relevance. The increasing demand shows that there is still a strong need for a neutral, community-driven space focused on real technical exchange. A big thank you to all speakers, sponsors, and participants who made SwiNOG #41 possible. See you at the next one. SwiNOG #42 is in the planning for this autumn. -steven SwiNOG Core Team

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Re: [Survey] When do you upgrade your network?
by Jacob Romain 27 Apr '26

27 Apr '26

Dear all, [My apologies if you receive multiple copies of this message] Thank you to all of you who already answered our survey on operators' main motives for network hardware upgrades. If you have not yet, it's not too late! Please help us get a more balanced worldview of the state of practices :-) => https://tally.so/r/rjEkZR Thanks a lot in advance for your help! -- Romain On 27/03/2026 11:01, Romain Jacob via wrote: Dear all, [My apologies if you receive multiple copies of this message] TL;DR I lead an academic research project to better understand the motives behind network hardware upgrades. If you are operating a network infrastructure and have 10 minutes to spare, we would greatly appreciate you filling out this short (anonymous) survey: https://tally.so/r/rjEkZR == Longer version == My name is Romain; I am a senior scientist at ETH Zürich, Switzerland, where I research the environmental impacts of Internet infrastructure and how we can steer networks to become more sustainable in the future. There is increasing evidence that a large part of the Internet's impact comes from the manufacturing, deployment, and recycling of hardware, suggesting that networks could substantially reduce their footprint by keeping network devices in operation for longer, despite possibly higher energy consumption in older hardware models. Some of my ongoing research aims to assess whether this hypothesis is correct; happy to tell you more about that if you are interested. Assuming it is indeed correct that network hardware should be kept in operation for longer, if we want to encourage this, we must understand why networks are being upgraded today. * What are the main motives behind network hardware upgrades nowadays? * What factors are preventing or discouraging longer hardware lifetime in networks? We prepared a short survey to help answer those questions. After some brief contextualization questions to clarify the network type and context, the core of the survey presents a list of possible motives for hardware upgrades and asks, for each, how important it typically is in your own network upgrades. The second half of the survey contains (optional) questions related to the current environmental sustainability practices in your organization. If you are operating a network or working for an organization that operates a public or private network infrastructure, we would greatly appreciate you filling out this short (anonymous) survey: https://tally.so/r/rjEkZR And, naturally, you are more than welcome to share this survey within your own network (of humans, I mean). Many thanks in advance! — Romain -- Romain JACOB Postdoctoral Researcher ETH Zurich Networked Systems Group (NSG) Lead: Prof. Laurent Vanbever www.romainjacob.net<https://www.romainjacob.net/> @RJacobPartner<https://twitter.com/RJacobPartner> @jacobr@discuss.systems<https://discuss.systems/@jacobr> Gloriastrasse 35, ETZ G84 8092 Zurich +41 7 68 16 88 22

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Contact Request - Ramon Wyss
by Simon Ryf 24 Apr '26

24 Apr '26

Hi all and sorry for the spam. Does anyone have a working email for Ramon Wyss? Please send me the email off list, thx. br Simon

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URI used by sbb.ch servicenew on SWIOG blacklist. Need help finding the URI
by Benoit Panizzon 02 Apr '26

02 Apr '26

Hi Team I got notified that email from service(a)sbb.ch sent from the US ServiceNow IP Address: 37.98.234.2 contain an URI blacklisted as 'spamtrap hit' in uribl.swinog.ch which causes most emails to get handled as spam (in our case rejected) Unfortunately I have not yet managed to get my hands on an email which contains this URI which is blacklisted. I opened a case with the SBB Customer service and they sent me such an email in an attempt to reproduce the issue: Received: from outbound09.service-now.com (outbound09.service-now.com [37.98.234.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by idefix.imp.ch (Postfix) with ESMTPS id 296EEC07A5 for <abuse(a)imp.ch>; Tue, 31 Mar 2026 17:14:35 +0200 (CEST) Unfortunately that email they sent me, contains no URI listed @uribl.swinog.ch sbb.ch and swisspass.ch are whitelisted, same for servicenow.com. What other URI could be contained in 'most' of the replies sent from service(a)sbb.ch? Any help appreciated! Mit freundlichen Grüssen -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________

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Peak incident Response 5-6. May in Geneva
by Serge Droz 02 Apr '26

02 Apr '26

Dear Swinogers In May, Geneva Cyber Week takes place — in Geneva, of course! The Swiss CSIRTs are organizing a two-day Technical Colloquium, "Peak Incident Response," on 5–6 May: https://www.first.org/events/colloquia/geneva2026/ <https://www.first.org/events/colloquia/geneva2026/>. Attendance is free and a great program is lined up. This is a technical conference focused on large-scale infrastructure. What makes the event special is that we won't only have technical folks, but also many people from the policy space — those working for UN agencies, nonprofits, and similar organizations. Today, running and securing the internet is more than technical work. It's important that the non-technical world understands our concerns and challenges. At the same time, this is an event that brings together the technologists — the people who actually do the hard, unglamorous work. This event is organized by volunteers; we've worked to make it free, and what we need now are participants who make it worthwhile. Talks are cheap: good questions in the Q&A and good conversations during the breaks are what make this event worth attending. I hope to see many of you there. Feel free to reach back if you have questions or comments Best Serge

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### SwiNOG #41 - Waiting List ###
by Simon Ryf 01 Apr '26

01 Apr '26

Sorry I wrote the wrong email: If you want to come, have no ticket and did not yet write to the Waiting List - please do so: “Waiting List” core(a)swinog.org (.org not .ch)

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### SwiNOG #41 (28.04.2026) - Agenda ###
by Simon Ryf 01 Apr '26

01 Apr '26

Dear SwiNOG community The Agenda for SwiNOG #41 - Tuesday 28th of April 2026 is published. - https://www.swinog.ch/meetings/swinog41/ (Very tiny slimy monsters delayed that a bit unexpectedly) Registration We’re fully booked but working hard to make it possible that we can raise the available seats. If you want to come, have no ticket and did not yet write to the Waiting List - please do so: “Waiting List” core(a)swinog.ch Location See details under Location at https://swinog.ch/mettings/swinog41/ Gurtenbahn / Cablecar to Gurten Please note, there is a new way how Gurtenbahn (the Cablecar to the event location) is handling tickets. -> Do not buy a Gurten Ticket yet, we will send you a voucher code (Gurten Ticket is included in the SwiNOG Ticket). Agenda 08:15 Registration, Coffee & Gipfeli (60 min) 09:15 Welcome & Agenda (5 min) Morning Session 1 — Network Strategy & Optical Infrastructure 09:20 Wouter Van Renterghem | RETN GmbH — 25 min The Road to Tier-"Something". Rethinking Network Strategy & Building Resilience Through PNIs, Peering and Smart Geographical Expansion. 09:45 Thomas Holterbach | University of Strasbourg — 20 min bgproutes.io: A next-gen BGP data collection platform 10:05 Gerhard Stein | Flexoptix GmbH — 25 min Understanding and optimising transceiver power consumption using internal metrics 10:30 Liam Taylor | EXA Infrastructure — 15 min Shared Spectrum & MOFN 10:45 Morning Break (45 min) Morning Session 2 — Swiss Internet Heritage 11:30 Arist Volger | SwissIX — 20 min 25 Years of SwissIX – A Quarter Century of Peering in Switzerland 11:50 Arist Volger | SwissIX — 5 min SwissIX Update 11:55 Lunch Break (90 min) Afternoon Session 1 — AI & Network Architecture 13:25 Tobias Bühler | netfabric.ai — 25 min Toward Agentic Network Operations: What AI Can (and Can't) Do 13:50 Jolly Trivedi | University of Turku — 25 min Ethics and Oversight in AI-Driven Cybersecurity 14:15 Remi Locherer | modus one ag with Arista Networks — 25 min EVPN Unleashed: Scaling Multi-Domain Fabrics with EVPN Gateways 14:40 Tilmann Zäschke | ETH Zürich — 20 min SCION Inter-Domain Routing 15:00 Afternoon Break (45 min) Afternoon Session 2 — Automation & Community 15:45 Damien Garros | OpsMill — 25 min The Network Automation Map: Navigate Your Journey with the NAF Automation Framework 16:10 Leandro Lerena | Zebbra AG — 15 min Building a Vendor-Agnostic E2E Testing Ecosystem with Netlab 16:25 TBD | Megaport — 15 min TBA 16:40 Andrew Vieyra | CommunityRack.org — 10 min CommunityRack.org - New Projects and Focus! 16:50 Severin Dellsperger | OST University — 10 min CHNUG 17:00 Social Event Already a big “Thank You” to our Sponsors [cid:1BCA7A73-E2FD-4A15-91FD-5E4E8CB7BC9B] [cid:D7ACD2E5-4528-4FCA-A021-466EE248E61C] and suporters [cid:649CB8B5-B9A1-4705-BC2D-CE2752C9CB6E] [cid:AAA9D4C8-E043-43EC-B83D-3382F86A24C2] [cid:03196310-AC0C-4792-83A1-1DF4BEC6BC16] [cid:68B00502-E516-438C-A38E-79DDE60A116D]

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[Survey] When do you upgrade your network?
by Romain Jacob 27 Mar '26

27 Mar '26

Dear all, [My apologies if you receive multiple copies of this message] TL;DR I lead an academic research project to better understand the motives behind network hardware upgrades. If you are operating a network infrastructure and have 10 minutes to spare, we would greatly appreciate you filling out this short (anonymous) survey: https://tally.so/r/rjEkZR == Longer version == My name is Romain; I am a senior scientist at ETH Zürich, Switzerland, where I research the environmental impacts of Internet infrastructure and how we can steer networks to become more sustainable in the future. There is increasing evidence that a large part of the Internet's impact comes from the manufacturing, deployment, and recycling of hardware, suggesting that networks could substantially reduce their footprint by keeping network devices in operation for longer, despite possibly higher energy consumption in older hardware models. Some of my ongoing research aims to assess whether this hypothesis is correct; happy to tell you more about that if you are interested. Assuming it is indeed correct that network hardware should be kept in operation for longer, if we want to encourage this, we must understand why networks are being upgraded today. * What are the main motives behind network hardware upgrades nowadays? * What factors are preventing or discouraging longer hardware lifetime in networks? We prepared a short survey to help answer those questions. After some brief contextualization questions to clarify the network type and context, the core of the survey presents a list of possible motives for hardware upgrades and asks, for each, how important it typically is in your own network upgrades. The second half of the survey contains (optional) questions related to the current environmental sustainability practices in your organization. If you are operating a network or working for an organization that operates a public or private network infrastructure, we would greatly appreciate you filling out this short (anonymous) survey: https://tally.so/r/rjEkZR And, naturally, you are more than welcome to share this survey within your own network (of humans, I mean). Many thanks in advance! — Romain -- Romain JACOB Postdoctoral Researcher ETH Zurich Networked Systems Group (NSG) Lead: Prof. Laurent Vanbever www.romainjacob.net <https://www.romainjacob.net/> @RJacobPartner <https://twitter.com/RJacobPartner> @jacobr@discuss.systems <https://discuss.systems/@jacobr> Gloriastrasse 35, ETZ G84 8092 Zurich +41 7 68 16 88 22

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SwiNOG #41 - Sold out / Waiting list
by Simon Ryf 25 Mar '26

25 Mar '26

Dear SwiNOG community, We are overwhelmed by the demand for seats for the upcoming event. While this is great news for everyone who already secured a ticket, we understand that it is frustrating for those who would still like to attend but have not been able to get one. We are currently in contact with the venue to see whether it is possible to increase capacity, but at this stage we cannot make any promises. If you do not have a ticket yet but would like to attend, please send an email to core(a)swinog.org with the subject “Waiting list” and a short message. Should we be able to release additional tickets, we will contact people on the waiting list in chronological order. BTW: We’re planning to release the agenda by the end of this week. Confirmation mails to the speakers are being prepared right now. Thank you and hope to see you at SwiNOG #41 SwiNOG Core Team

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tempfail issues with: mailout01.mail.admin.ch
by Benoît Panizzon 24 Mar '26

24 Mar '26

Hi Are others also experiencing issues when temp failing arbitrary recipients from mailout01.mail.admin.ch ? To explain the situation: Our spamfilter gives the recipient to choice to either reject, quarantine aka spamfolder or accept an email classified as spam. Example: Alice sends spam to Bob and Charlie Bob wants spam rejected Charlie wants spam quarantined. Spam can only be rejected after the DATA phase, when both recipients have been accepted during RCPT TO. Dropping Bob from the recipient list and only delivering to Charlie is a NO GO, we confirmed the RCPT TO to Bob with 250 so we have to deliver. Rejecting the whole email does contradict the setting of Charlie. To solve this, we tempfail any recipients whose spam settings differ from the first recipient like this: MAIL FROM:<alice(a)example.com> 250 2.1.0 Ok RCPT TO:<bob(a)example.net> 250 2.1.5 Ok RCPT TO:<charlie(a)example.net> 452 4.5.3 Resend separately 452 4.5.3 is the same code used to indicate 'too many recipients' and therefore triggers an immediate fork of the original message to the remaining recipients on the sending MTA usually without any notable delay. The only server which seems to regularly stop transmitting the email to the remaining recipients and returns a 'hard bounce' to the sender after having sent the email to 'some' of the recipients is mailout01.mail.admin.ch Anyone observing the same issue? Anyone having a contact at BIT which could help with further investigation into the cause of the issue observed? I attempted to open a case some time ago but got no where. -- Mit freundlichen Grüssen -Benoît Panizzon- @ HomeOffice und normal erreichbar -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________

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