dnsmasq

Linux dns server, also great as a dhcp server for the local subnet.
Has the advanced feature where it can add matched lookup ip's to a ipset that can then be used to firewall certain traffic.
Problem: 201808 High cpu as dnsmasq and systemd-resolve seem to fight/loop.
- Disable systemd-resolve by editing config and restarting.
  - ```
  echo "DNSStubListener=no" >> /etc/systemd/resolved.conf
  sudo service systemd-resolved restart
```

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