!tCyGickeVqkHsYjWnh:nixos.org

NixOS Networking

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Declaratively manage your switching, routing, wireless, tunneling and more. | Don't rely on `networking.*` use systemd-networkd and NetworkManager instead. | Set `SYSTEMD_LOG_LEVEL=debug` to debug networking issues with networkd | No bad nft puns, please. | Room recommendations: #sysops:nixos.org248 Servers

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6 Aug 2025
@frederic:scs.ems.hostFrédéric Christ changed their display name from Frédéric Christ to Frédéric Christ 🏕️ 15.8..08:28:52
8 Aug 2025
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@nikstur:matrix.orgniksturI had some fun and let systemd networkd take care of the ipv6 privacy extensions instead of our custom udev rule: https://github.com/NixOS/nixpkgs/pull/43196717:11:16
@emilazy:matrix.orgemily shouldn't we maybe be using kernel? 17:13:30
@emilazy:matrix.orgemilyto match the kernel's default preference17:13:34
@emilazy:matrix.orgemilyrather than having two knobs17:13:47
@emilazy:matrix.orgemily also, it can be set in networkd.conf 17:14:09
@emilazy:matrix.orgemily so we don't need a separate .network for it 17:14:16
@emilazy:matrix.orgemilyah I guess the kernel preference is per-interface17:15:41
@emilazy:matrix.orgemily systemd.network.config.networkConfig.IPv6PrivacyExtensions = lib.mkDefault true; should do it, though 17:15:50
@emilazy:matrix.orgemily btw (sorry for doing this on Matrix rather than leaving reviews, I haven't had the time to do a proper substantive review) is there a reason you got bash out of the iptables closure rather than just disabling iptables? it's pretty legacy itself at this point, and systemd is dropping support for it in 259 17:17:02
@emilazy:matrix.orgemily
* The legacy iptables support through libiptc will be removed in v259.
  Only nftables backend will be supported by systemd-networkd and
  systemd-nspawn since v259.
17:17:10
@elvishjerricco:matrix.orgElvishJerricco I'm pretty sure this doesn't actually work. Have you checked that the expected things actually get set with interfaces that are actually configured with networkd? With networkd, an interface only ever applies a single .network file, and drop-ins for that file; the first one whose Match section matches it. So if I've got a 40-eth0.network, this 99-default-ipv6-privacy-extensions.network won't apply to my eth0 it at all. 19:29:40
@elvishjerricco:matrix.orgElvishJerricco emily's idea of just adding a default value for that directive in the networkConfig option would fix that. 19:30:48
@emilazy:matrix.orgemily(we should have a test for this if we don't)19:31:13
@nikstur:matrix.orgniksturUntil we have 259, I don't see a way to get it out of the systemd closure. That's why I removed bash from it. I think that's fine for now.19:46:41
@nikstur:matrix.orgniksturSounds good, I'll apply that19:46:52
@emilazy:matrix.orgemilyhuh I thought it was optional already19:46:58

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