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I am wondering if I actually need dnsmasq or Bind to apply the following simple DNS server rule:

Forward DNS lookups for *.mydomain.com to 10.0.0.2;

Forward DNS lookups for anything else to 8.8.8.8 or 8.8.4.4

Or can I do that in a /etc/netplan/*.yaml file using the nameserver field somehow?

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It is possible to configure systemd-resolved to do this, but not through netplan. E.g. systemd-resolve -i ens2 --set-dns=10.0.0.2 --set-domain=~mydomain.com

You should also be able to configure this statically with a .network file; see systemd.network(5) for information.

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  • I tried creating a foo.network file in /etc/systemd/network and populating it simply with [Network]\nDNS=10.0.0.2\nDomains=mydomain.com but it didn't work.
    – jsstuball
    Feb 8, 2019 at 4:29
  • You may need to make sure you apply a [Match] rule as well, and you also need to make sure the filename you use lexically sorts before 99-default.link, otherwise /lib/systemd/network/99-default.link will take precedence. To be honest I have not used .network files like this myself however, so I only know the generalities of how it's supposed to work.
    – slangasek
    Feb 8, 2019 at 19:39

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