[Bug 1790628] Re: systemd from 18.04 fails to resolve name without domain

[Dimitri John Ledkov]

Domain-less external/network lookups are not supported.

Domain must be set on DNS Servers: 192.168.200.1

Either change your router settings to set a domain of your choice,
or make one up in /etc/systemd/resolved.conf by changing Domains= setting

If you set a domain, do things start to resolve?

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Title:
  systemd from 18.04 fails to resolve name without domain

Status in systemd package in Ubuntu:
  New

Bug description:
  On 16.04 I had no problems. On 18.04 systemd-resolved fails to resolve
  host name without domain (using nslookup) even though DNS server is
  reported by systemd-resolve --status. If to provide DNS to nslookup
  explicitly, then the name is resolved.

  $ systemd-resolve --status
  Global
            DNSSEC NTA: 10.in-addr.arpa
                        16.172.in-addr.arpa
                        168.192.in-addr.arpa
                        17.172.in-addr.arpa
                        18.172.in-addr.arpa
                        19.172.in-addr.arpa
                        20.172.in-addr.arpa
                        21.172.in-addr.arpa
                        22.172.in-addr.arpa
                        23.172.in-addr.arpa
                        24.172.in-addr.arpa
                        25.172.in-addr.arpa
                        26.172.in-addr.arpa
                        27.172.in-addr.arpa
                        28.172.in-addr.arpa
                        29.172.in-addr.arpa
                        30.172.in-addr.arpa
                        31.172.in-addr.arpa
                        corp
                        d.f.ip6.arpa
                        home
                        internal
                        intranet
                        lan
                        local
                        private
                        test

  Link 3 (wlp4s0)
        Current Scopes: none
         LLMNR setting: yes
  MulticastDNS setting: no
        DNSSEC setting: no
      DNSSEC supported: no

  Link 2 (enp0s31f6)
        Current Scopes: DNS
         LLMNR setting: yes
  MulticastDNS setting: no
        DNSSEC setting: no
      DNSSEC supported: no
           DNS Servers: 192.168.200.1

  $ nslookup sniffer
  Server:         127.0.0.53
  Address:        127.0.0.53#53

  ** server can't find sniffer: SERVFAIL

  $ nslookup sniffer 192.168.200.1
  Server:         192.168.200.1
  Address:        192.168.200.1#53

  Name:   sniffer
  Address: 192.168.200.1

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