bortzmeyer, to random French
@bortzmeyer@mastodon.gougere.fr avatar

Bonjour, Paris ! Aujourd'hui, c'est NetGouv https://netgouv.hypotheses.org/516

bortzmeyer,
@bortzmeyer@mastodon.gougere.fr avatar

Sophie Hamel raconte son terrain dans le Pacifique (Fidji, Vanuatu) sur leur accès Internet (Fidji, bien connecté, Vanuatu « au bout du réseau »). L'Australie et la Chine se disputent ces pays (câbles, machines) mais pour l'instant, l'Australie tient Huawei à distance.

Depuis Digicel Fidji vers Vodafone Vanuatu : on passe par l'Australie.

@nasiviru

bortzmeyer, to random French
@bortzmeyer@mastodon.gougere.fr avatar

Journées , pour l'instant on en est aux croissants et pains au chocolat (c'est au nord de la Loire).
https://federez.net/journees/2024/

bortzmeyer,
@bortzmeyer@mastodon.gougere.fr avatar

« J'évite de parler de "mesures actives" car c'était le terme utilisé par le KBG pour ses actions. »

jschauma, to sysadmin
@jschauma@mstdn.social avatar

Hey Fediverse! The Spring semester is about to start, and I'll be teaching System Administration again:

https://stevens.netmeister.org/615/

Topics covered include: basic operating system & filesystem concepts, software installation & package management, config management, automation, tools development, TCP/IP networking, common services, system security.

All lectures are online as free videos; if you'd like to follow along, here's the playlist for Week 1:

https://www.youtube.com/playlist?list=PLDadzdouM0VCV7tjurqM8FHY6APK9wvJl

jschauma,
@jschauma@mstdn.social avatar

This week in my #SysAdmin class, we continue with networking.

We start on our box and strace/ktrace a simple telnet command to see how we even get to the point of #DNS resolution (/etc/nsswitch.conf, /etc/hosts, /etc/resolv.conf), then #tcpdump a simple HTTP request to observe:

  • #ARP / #NDP calls to find the default route and local resolver
  • #UDP DNS lookup
  • #TCP handshake
  • HTTP protocol

After that, we look at #ICMP and observe #traceroute packets.

https://www.youtube.com/playlist?list=PLDadzdouM0VBzJK3Aq9AaJMWUOnljP4yv

#SRE #DevOps

LibreFaso, to random French

C'est quoi ce chelou ?
traceroute 9.9.9.9
traceroute to 9.9.9.9 (9.9.9.9), 30 hops max, 60 byte packets
1 _gateway (192.168.1.1) 7.093 ms 7.345 ms 7.187 ms
2 * * *
3 * * *
4 * * *
5 * * *
6 196.207.250.242 (196.207.250.242) 35.061 ms dns9.quad9.net (9.9.9.9) 93.592 ms !X 96.486 ms !X

(cf https://www.debian-fr.org/t/orange-flybox-diagnostic-reseau/88740/2 )

kohelet, to linux
@kohelet@mstdn.social avatar

Did you know the command traceroute is sending "SUPERMAN" as data in the UDP packet?

The other day was learning about the difference between tracert and traceroute, and noticed that when sniffing.

Couldn't find anything online but the source code (added in comment) of where it sens SUPERMAN.

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