HEPiX IPv6 Working Group - in person at CERN - dates now confirmed

Name: HEPiX IPv6 Working Group - in person at CERN - dates now confirmed
Start: 2025-05-21T13:30:00+02:00
End: 2025-05-22T13:00:00+02:00
Location: CERN

21 May 2025, 13:30 → 22 May 2025, 13:00 Europe/Zurich

513/1-024 (CERN)

513/1-024

CERN

Show room on map

David Kelsey (Science and Technology Facilities Council STFC (GB)), Edoardo Martelli (CERN)

Description

We will meet in person at CERN. Zoom connectivity will also be available for those of you who cannot attend in person.

Registration is now open - please register for attendance, even if remote, and specifying if you will attend in person (or not).

Agenda time slots could change - offers of talks/topics are still welcome

Registration

Participants

Andrea Sciabà
Bruno Heinrich Hoeft
Costin Grigoras
Dale Carder
David Kelsey
Edoardo Martelli
Francesco Prelz
Martin Bly
Raul Lopes
+4

64006864374

Edoardo Martelli

Join via phone

Wednesday 21 May
- Wed 21 May
- Thu 22 May
- Session 1 513/1-024
  
  513/1-024
  
  CERN
  
  50
  Show room on map
  - 1
    
    Welcome, agenda, note taker(s)
  - 2
    
    General news
    
    Anything to be shared or discussed?
    News from Manchester LHCOPN/LHCONE meeting (March 2025) relating to IPv6
    
    Speakers: David Kelsey (Science and Technology Facilities Council STFC (GB)), Edoardo Martelli (CERN)
  - 3
    
    Status of the CPU services ticket campaign
    
    Speaker: Dr Andrea Sciabà (CERN)
    
    Twiki
  - 4
    
    Data transfers still using IPv4 and how to flip to IPv6
    
    Discussion
    Is monitoring of V4 versus V6 now complete and reliable?
    
    What is recent IPv6 percentage on LHCOPN?
    And same on LHCONE?
    
    Perhaps look now at Top IPv4-talkers on LHCOPN?
    particularly interested in USA/Canada LHCOPN links (BNL, FNAL, TRIUMF) for agenda item later today
    
    Speakers: Bruno Heinrich Hoeft (KIT - Karlsruhe Institute of Technology (DE)), David Kelsey (Science and Technology Facilities Council STFC (GB)), Edoardo Martelli (CERN)
    
    IPv4 to American Tier1s in LHCOPN
    
    IPv4 vs IPv6 in LHCOPN
    
    LHCOPN-IPv6_usage.pdf
    
    LHCOPN-IPv6_usage.pptx
  - 15:30
    
    Break
  - 5
    
    Plans and timetable for IPv6-only
    
    Discussion by all. DaveK may not be available and/or not prepared!
    
    Discuss timetable for removal of IPv4 on data transfers.
    Well before start of LH-LHC Run4
    
    What about moving to IPv6-only Workernodes and WLCG clients?
    
    When can we remove IPv4 from WLCG storage services? We often said that this would be the last to go.
    
    Speaker: David Kelsey (Science and Technology Facilities Council STFC (GB))
  - 6
    
    Update from USA/ESnet
    
    Could include news from US-ATLAS & BNL
    and US-CMS & FNAL
    
    There is a proposal from ESnet (from recent meeting with US-ATLAS & US-CMS) to turn off IPv4 on LHCOPN between CERN and USA.
    
    Start with this proposal (Shawn McKee? and/or Dale Carder?)
    
    Not just data transfer traffic between CERN (Tier0) and the two Tier1s... But also traffic between US Tier1s and other Tier1 around the globe. Can we determine how the current IPv4 traffic splits between CERN traffic and other Tier1s?
    
    What is the process for "approval" and defining timetables?
    Stake holders: ESnet, experiments, Tier0 CERN and all Tier1s,...
    WLCG Management Board should be involved
  - 7
    
    Roundtable news/updates from Sites - or delay to next day?
Thursday 22 May
- Wed 21 May
- Thu 22 May
- Session 2 513/1-024
  
  513/1-024
  
  CERN
  
  50
  Show room on map
  - 8
    
    Roundtable news/updates from Experiments
    
    And also sites if not covered yesterday
  - 9
    
    Updates from perfSONAR, RNTWG/SciTags etc - Replace by paper for Oct 2025 LHCOPN meeting?
    
    No talk confirmed - usual speakers not registered
    
    LHCOPN meeting in Karlsruhe - Oct 2025.
    We need to draft a paper proposing removal of IPv4 peering on LHCOPN.
    And what about on LHCONE as well?
    A good time to discuss/agree what needs to be in the paper - agree sections and table of contents now?
  - 10
    
    Upcoming conferences and other presentations - so could continue discussion of timetable for IPv6-only deployment
    
    Not aware of anything close - conferences - but is there?
    
    Discuss timetable for removal of IPv4 on data transfers.
    What about moving to IPv6-only Workernodes and WLCG clients?
    When can we remove IPv4 from WLCG storage services? We often said that this would be the last to go.
  - 11:00
    
    Break
  - 11
    
    Other issues to discuss?
    
    All discuss
  - 12
    
    AOB, Dates of next meetings
    
    Next in person meeting. Would be useful to meet again before the LHCOPN/LHCONE meeting in Karlsruhe (October).
    
    So perhaps we can meet at CERN in September 2025? Or would a meeting same week as LHCOPN meeting in Karlsruhe work?
    
    Next meeting after that for a meeting away from CERN - if we do not decide to meet in KIT in October.
    
    One date that would work for DaveK - at CERN - Wed/Thursday 17 and 18 September 2025 - any good?