!tCyGickeVqkHsYjWnh:nixos.org

NixOS Networking

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Declaratively manage your switching, routing, wireless, tunneling and more. | Don't rely on `networking.*` for interface and routing setup, use systemd-networkd, ifstate or NetworkManager instead. | Set `SYSTEMD_LOG_LEVEL=debug` to debug networking issues with networkd | No bad nft puns, please. | Room recommendations: #sysops:nixos.org254 Servers

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12 Feb 2026
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13 Feb 2026
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15 Feb 2026
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@tom:dragar.deTomRedacted or Malformed Event17:54:42
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@tom:dragar.deTomI just checked when there could be a NixOS Release with the NetworkManager CLAT Support. It isn't (already) included with 1.56.0 from 3 days ago. So it'll probably be 1.58.0 which looks like it could happen August/September. So at the earliest it'll be NixOS 26.11. I guess i'll have to check how much of a problem it would be to override it locally. At least temporarily to satisfy my desire to play with it. 😅18:06:12
@nico:c3d2.deNicoWait what, network manager has clat support now?19:23:55
@nico:c3d2.deNicoJust found this, if I have the time, I will definitely test this... https://gist.github.com/alexhaydock/3a458b36ce79851f4576794e5f18e1d5 I even have a test prepared 😂 https://github.com/secshellnet/nixos-tests/pull/319:25:27
@tom:dragar.deTomah, nice find that gist19:37:16
@me:m4rc3l.deMarcelwhen I've thried the MR in networkmanager with nixos I had to diable the firewall. I have not yet investigated which changes would need to be done.19:39:16
@hexa:lossy.networkhexa (clat on linux when)I don't suppose that networkmanager allows matching its version by the dhcp server19:41:27
@hexa:lossy.networkhexa (clat on linux when)to understand whether the version supports 464xlat19:41:45
@hexa:lossy.networkhexa (clat on linux when)I mean, I can certainly send out pref64/v6-only-preferred unconditionally19:43:14
@hexa:lossy.networkhexa (clat on linux when)but last time I checked some clients behaved weirdly19:43:31
@me:m4rc3l.deMarcel in dresden the only clients that behaved strangly was Sandro 🐧 kde connect because it forces v4 even if both clients have v6 addresses. All other problens were solved with pref64 and ipv4only.arpa. records. 19:47:31
@me:m4rc3l.deMarcel and coperate VPNs 19:47:57
@me:m4rc3l.deMarcel * and some coperate VPNs 19:48:02
@tom:dragar.deTomFreifunk Karlsuhe seems to have rolled out IPv6 mostly at the end of last year https://chaos.social/@ffka (German) It would probably make sense to talk to them at some point. But it makes me kinda hopeful that the Apple weirdness i observed in 2024 has disappeared enough (by patches and people constantly upgrading their devices) that it becomes viable at some point. But i think my Pixel 8a with current Graphene OS still has the issue that the network stack sometimes becomes unresponsive and only a reboot fixes if it's in a ipv6 mostly enviroment.20:15:30
@tom:dragar.deTomyeah, it seems to be working for me with 1.57.2-dev21:41:14
@tom:dragar.deTom But looking at tcpdump it doesn't seem like you can even easily tell (if at all) it's a networkmanager dhcp request. So matching based on version seems even more out of the question.
(You could ofc set ipv4.dhcp-vendor-class-identifier but that doesn't seem scalable)
21:59:19

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