[Bug 1945288] Re: Search domains missing from resolv.conf stub

[Marko]

Happens as well on Ubuntu 20.04, very annoying because it works fine if
those domains are manually added to /run/systemd/resolve/stub-
resolv.conf file so there's not real limit since glibc is not the issue
anymore.

This of course gets overwritten on any network change, and in case of
VPN connections this happens a lot.

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Title:
  Search domains missing from resolv.conf stub

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  System is Mint 20.2, with the relevant packages taken from Ubuntu
  Focal.

  This is the output of `systemd-resolv --status vpn0`:
      Link 7 (vpn0)
            Current Scopes: DNS
      DefaultRoute setting: yes
             LLMNR setting: yes
      MulticastDNS setting: no
        DNSOverTLS setting: no
            DNSSEC setting: no
          DNSSEC supported: no
        Current DNS Server: 10.0.0.53
               DNS Servers: 10.0.0.53
                DNS Domain: example.com
                            example.com.rpz
                            privatelink.blob.core.windows.net
                            node.prd.lan.example.com
                            node.stg.lan.example.com
                            node.dev.lan.example.com

  However that last domain is missing from `/etc/resolv.conf` (symlink to `/run/systemd/resolve/stub-resolv.conf`), instead there is a line
      # Too many search domains configured, remaining ones ignored.

  According to resolv.conf(5) since glibc 2.26 the number of search
  domains should be unlimited, and installed is 2.31-0ubuntu9.3

  VPN is PaloAlto GlobalProtect through the OpenConnect plugin on
  NetworkManager.

  Exact same setup and behaviour for a colleague using Pop!_OS 20.04

  --
  systemd:
    Installed: 245.4-4ubuntu3.13
    Candidate: 245.4-4ubuntu3.13
    Version table:
   *** 245.4-4ubuntu3.13 500
          500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       245.4-4ubuntu3.11 500
          500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
       245.4-4ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

  libc-bin:
    Installed: 2.31-0ubuntu9.3
    Candidate: 2.31-0ubuntu9.3
    Version table:
   *** 2.31-0ubuntu9.3 100
          100 /var/lib/dpkg/status
       2.31-0ubuntu9.2 500
          500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
       2.31-0ubuntu9 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

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