Cake & Celebration TOMORROW 
UCPH HeaDS is turning 5 and SUND DataLab is hosting the party! 
We've grown so much, and now we want to celebrate with you.
Drop by for cake, drinks & good company—no RSVP needed, just come hang out!
14 March
13:00–16:00
Panum 33.4.D
https://heads.ku.dk/calendar/2025/events/sund-datalab-open-house/
Tonight (13th March), #NetMCR (https://www.netmcr.uk/) are having a #MeetUp again at the Northern Monk in #Manchester (https://www.northernmonk.com/pages/manchester).
The meeting starts at 7pm, come and listen to talks (or give one yourself) about #networking subjects, and mingle with other networky-types 
Tonights talk is by Marek Isalski - 'What happens when an altnet goes bust?' An interactive discussion session about the possible "unhappy paths" of altnet business models, when both scaling-up and selling-out fail.
Sadly I'm not going this month as I'm WFH, but I enjoyed myself last time. The talk was really interesting and the food was nice.
Writing my first meshcore PR 
It's still a work-in progress, but having a lot of fun learning this code base!
If I can get my OPNsense device setup again, I can have a DMZ on my home network, migrate my public web services to my homelab, and save money by eliminating my main VPS. I just can't guarantee 99% uptime, then. Which is fine, I guess. And the OPNsense device won't be a dust collector.
Hi y'all, this has become a bit more important now. I learned this week that my current contract will not be renewed for funding reasons. Please see the quoted post for more info! 
#FediHire #GetFediHired #OpenStreetMap #Python #Rust #JavaScript #CSharp #C #GIS #DistributedSystems #Networking
RE: https://transfem.social/notes/a4imho4jra5v01up
@camilla_hoel @bookstodon There is this nice tradition of network admins from all over the globe to add a special "invisible" "X-Clacks-Overhead" HTTP header to their websites in memory of Terry Pratchett.
The header itself doesn't serve a function, but it is always nice to find it when analyzing network traffic and knowing that you are not alone in missing Terry Pratchett.
#Networking Opportunities: The #DFG invites researchers from German Universities of Applied Sciences & from Central Asia to participate in an initiative for collaboration in knowledge-driven research in the natural and engineering sciences. Submit a poster: April 15, 2025. https://www.dfg.de/de/aktuelles/neuigkeiten-themen/info-wissenschaft/2025/ifw-25-22
38 representatives of 27 organizations (including 16 #NRENs) from 17 countries participated 
in the #FileSender Online #Infoshare on February 24, 2025. This #online gathering gave FileSender #community enthusiasts 
the opportunity not just to listen in and be kept abreast of new developments and future plans, but also to contribute: present their views, exchange experiences and share expectations. 
Details on 
https://filesender.org/filesender-online-infoshare-update-on-release-3-0-and-security-approach/
In this guide, we will explore various methods to disable IPv6 on Ubuntu 24.04.
https://greenwebpage.com/community/how-to-disable-ipv6-on-ubuntu-24-04/
Deep Dive into All Things Networking with CEO & Career Coach Rachel Serwetz!
Tuesday, March 25 at 12pm Eastern WNB.rb will be hosting Rachel for our March Online Meetup.
Are you nervous to network? Not sure how, when, or why we should network with other professionals, or how it can help you? In this talk, CEO & Career Coach Rachel Serwetz will deep dive into what networking really means and doesn’t mean, how to make it comfortable and strategic for you.
At #VB2025, the top minds in cybersecurity come together to share real-world research, insights, and strategies that help us all stay ahead.
24-26 September 2025Berlin, Germany
Click to learn more https://tinyurl.com/m6ru83bp
Will you be there?
NEW on We 
Open Source
Linux sysadmins, these 10 essential commands will help you monitor & troubleshoot networks! 
Don Watkins shares tools like ping, traceroute, & nmap to keep your systems running smoothly.
Read more: https://allthingsopen.org/articles/10-sysadmin-networking-commands
#T3DD25 is packed with exciting side events beyond the sessions!
From Social Night & Coding Night to Breathing Training & Quiz Night, there’s something for everyone. 
Don’t miss out—see all events at https://t3dd.typo3.com/side-events
______
#TYPO3 #DeveloperDays #Networking
IPv4 Addresses & Subnetting: Your Ultimate Guide
Join CISSP training - https://infosectrain.com/courses/cissp-certification-training/
TALKING HeaDS - March 2025
Join us for an afternoon of #healthdatascience, #drinks, and #networking!
Talk by Cedric Notredame on pumping structural data into protein phylogeny using the Nextflow pipeline language.
25 Mar, 15:00–17:00Panum, University of CopenhagenRSVP: https://heads.ku.dk/calendar/2025/talking-heads/talking-heads-mar2025/
If the target exists within your subnet:
Your OS determines the hardware address of the destination by referencing its ARP table. If there is no entry in the ARP table for that address, the system sends out a hardware broadcast that is flooded to all devices on the layer 2 network. The system who owns the IP address would then respond to the broadcast with its hardware address (MAC ADDR). The OS would then send the data along, with it never leaving the local network.
If the target does NOT exist within your subnet:
Your OS determines where to send the packet based on its routing table. Most often than not, the packet will be destined for the default gateway. This gateway is generally a router which will use its own routing tables to send the packet on its way to its final destination. The process of sending to the default gateway is the same as sending to another host on the subnet. If the gateways MAC address isn't in the ARP table, it will send a broadcast out to determine the gateways hardware address, and then forward the frame.
#networking
https://serverfault.com/questions/564934/why-does-operating-system-need-to-know-subnet-mask
Hey scientists!
How do you go about building and sustaining networks these days? In particular, I'm interested in how to build functional interdisciplinary working groups, across institutions.
Seems like the best place at the moment is LinkedIn, but it seems like it's just about ripe for enshittification (similarly with BlueSky).
Mastodon doesn't really have the tools (e.g. groups). Slack and other things are also walled gardens. Matrix might be cool, but I suspect it's going to be a struggle to get people on to it..
E-lists are a potential option, but they get messy above a certain point, and the moderation tools are weak. And also just .. ew.
Any other suggestions?
Internet Pioneer Vint Cerf at SharkFest'25 US!
We’re beyond excited to welcome back Vint Cerf, one of the founding fathers of the internet, to SharkFest'25 US!
As a visionary behind TCP/IP and a true innovator in networking, Vint will bring unparalleled insights into the future of the internet.
