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| == Troubleshooting == | | == Troubleshooting == |
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| === Adding network printer "Name or service not known" ===
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|
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| {{Note|This problem is fixed in nixpkgs-unstable. Remove this section after NixOS 23.11 EOL.}}
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|
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| If CUPS complains about "''Impossible to connect to XXX.local: Name or service not known''" even if {{nixos:option|services.avahi.nssmdns}} is enabled as shown above, the reason could be that mdns does not work properly with IPv6 in your network. In such a case, switching to mdns4-only setup can help:
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| <syntaxhighlight lang="nix">
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| {
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| ...
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| services.avahi.nssmdns = false; # Use the settings from below
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| # settings from avahi-daemon.nix where mdns is replaced with mdns4
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| system.nssModules = pkgs.lib.optional (!config.services.avahi.nssmdns) pkgs.nssmdns;
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| system.nssDatabases.hosts = with pkgs.lib; optionals (!config.services.avahi.nssmdns) (mkMerge [
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| (mkBefore [ "mdns4_minimal [NOTFOUND=return]" ]) # before resolve
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| (mkAfter [ "mdns4" ]) # after dns
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| ]);
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| }
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| </syntaxhighlight>
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| See [https://github.com/NixOS/nixpkgs/issues/118628 this bug report] for details.
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| === Upgrade required === | | === Upgrade required === |
