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NixOS Networking

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13 Apr 2026
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14 Apr 2026
@uep:matrix.orguep

i'm getting coredumps from bind nameservice daemon, cause unclear. The last thing in the logs is

network unreachable resolving 'ns1.anycastdns.cz/A/IN': 2a00:fea0:dead::beef#53

though it's not certain that this is the cause, nor would I expect bind to coredump on such an error

01:17:10
@uep:matrix.orguepanyone else seeing similar, known issue, just me, etc?01:17:23
@hexa:lossy.networkhexahave you looked at the coredumps?11:08:03
@hexa:lossy.networkhexaI don't fancy bind9 tbh11:08:24
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@uep:matrix.orguepNot yet, too far down the list right now. I deliberately don't depend on it for anything important, which is handy now but also means I took a while to notice and I fixed the one thing that was depending on it more than it should have22:43:02
16 Apr 2026
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@antifuchs:asf.computerantifuchs 17:35:35
@antifuchs:asf.computerantifuchs so, hm, I have not rebooted this host in a while (47 days since last boot on nixos-unstable, using systemd.networkd.enable=true) but now that I have rebooted it, it is refusing to set up its hostbr0 bridge, networkctl reports that hostbr0 is in "no-carrier configuring" state, ip -br l shows that interface as DOWN in NO-CARRIER state; it's backed by an ethernet device that also shows no carrier (but ... has a lit link LED)? I'm really at a loss how to debug this, all signs say this should work but it doesn't come up. 18:58:21
@antifuchs:asf.computerantifuchs(deleting the bridge and setting the ethernet interface up shows traffic if I tcpdump it, I should add)18:59:20
@antifuchs:asf.computerantifuchsoh, that's right, there should be VLAN netdevs that aren't created19:06:55
@antifuchs:asf.computerantifuchs yeuuuup, looks like [Match] block semantics changed: previously in a .network file I had to match the "old" name (enp*) when now I have to match the renamed name that a preceding .link file effects 19:09:41
@magic_rb:matrix.redalder.orgmagic_rbHow wonderful20:28:33
@oddlama:matrix.orgoddlama
In reply to @antifuchs:asf.computer
yeuuuup, looks like [Match] block semantics changed: previously in a .network file I had to match the "old" name (enp*) when now I have to match the renamed name that a preceding .link file effects
I always had the least amount of pain when I matched hardware interfaces by MACAddress
20:44:22
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17 Apr 2026
@antifuchs:asf.computerantifuchs
In reply to @oddlama:matrix.org
I always had the least amount of pain when I matched hardware interfaces by MACAddress
Well, I did that in addition but since there are bridges with inherited Mac’s in the mix, the config also has to match on device names
02:59:52
@antifuchs:asf.computerantifuchsIt’s supremely annoying and makes me want to redo the whole thing but also … not03:00:11
@hexa:lossy.networkhexathat breaks with vlans though03:06:55
@hexa:lossy.networkhexaRedacted or Malformed Event03:07:07
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19 May 2021
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