nixos/network-interfaces-systemd: don't set network-level domains

systemd.network(5) describes Domains= as a "list of domains which should
be resolved using the DNS servers on this link." This setting is read by
systemd-resolved.service, and it's used to configure both search domains
and DNS query routing.

Adding the search domains from `networking.search` is unnecessary
because these are already configured globally in `resolved.conf` through
the default value of `services.resolved.domains`.

Adding the system's `networking.domain` to each network is unexpected
and probably incorrect. A user may not expect that the domain is in
effect automatically added to the search domains even if not specified
in `networking.search`.

Both of these network-level assignments are problematic in cases where
the NixOS networkd module is not managing every interface on the system.
In that scenario, the managed interfaces will have Domains= set while
the others do not. That will cause systemd-resolved to route DNS queries
for the search domains and the system domain to only those managed
interfaces.

0 files changed, 0 insertions, 0 deletions