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Today (it is 2019-05-19) I can't connect to internal resource within VPN – it worked OK the day before. It happens because DNS doesn't resolve internal names.

systemd-resolve shows this

$ 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 4 (vpn0)
      Current Scopes: none
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no

Link 3 (docker0)
      Current Scopes: none
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no

Link 2 (enp3s0)
      Current Scopes: DNS
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 192.168.1.254
                      fe80::1
          DNS Domain: ~.

What can it be? VPN problem? Ubuntu updates? I updated something yesterday, didn't even care what exactly.

Ubuntu 18.04 BTW. Default IPv4 parameters: DHCP, etc.

UPD it looks like DNS servers are here. It is yet another systemd-resolve issue:

… NetworkManager[1015]: <info>  [1558277941.8897] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",0]: VPN connection: (IP Config Get) reply received.
… NetworkManager[1015]: <info>  [1558277941.8915] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: VPN connection: (IP4 Config Get) reply received
… NetworkManager[1015]: <info>  [1558277941.8922] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data: VPN Gateway: ★★★.★★★.★★★.★★
… NetworkManager[1015]: <info>  [1558277941.8922] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data: Tunnel Device: "vpn0"
… NetworkManager[1015]: <info>  [1558277941.8922] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data: IPv4 configuration:
… NetworkManager[1015]: <info>  [1558277941.8922] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Internal Address: 10.5.0.81
… NetworkManager[1015]: <info>  [1558277941.8922] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Internal Prefix: 24
… NetworkManager[1015]: <info>  [1558277941.8922] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Internal Point-to-Point Address: 10.5.0.81
… NetworkManager[1015]: <info>  [1558277941.8922] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.121.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.1.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.200.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.90.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.136.156.0/26   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 62.76.112.14/32   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 62.76.112.20/32   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.5.0.0/24   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 62.76.112.15/32   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 62.76.112.13/32   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 172.22.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 172.21.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8923] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.160.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8924] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 192.168.100.0/24   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8924] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 172.20.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8924] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.20.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.140.1.0/24   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.130.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.7.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.110.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.80.1.0/24   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.120.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.100.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.150.1.0/24   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.170.0.0/16   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Static Route: 10.5.0.0/24   Next Hop: 0.0.0.0
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Internal DNS: 10.110.1.2
… NetworkManager[1015]: <info>  [1558277941.8925] vpn-connection[0x5647781d64c0,e7c29208-dec3-4b54-969f-6ef43b29a502,"Job",4:(vpn0)]: Data:   Internal DNS: 10.100.1.3
Improve this question
19
  • Your VPN isn't working. Reboot and see if that fixes things. Else edit your question and show me ls -al /etc/resolv.conf and cat /etc/resolv.conf.
    – heynnema
    May 19, 2019 at 19:38
  • @heynnema The VPN is working actually: host <internal addr> 10.100.1.3 returns actual internal IP address. It is upper, DNS user space utilities that don't work. So, ls -al /etc/resolv.conf gives lrwxrwxrwx 1 root root 39 фев 3 22:20 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf And cat /etc/resolv.conf returns lots of comments and these two lines: nameserver 127.0.0.53 options edns0
    – Denis Cheremisov
    May 19, 2019 at 23:06
  • I see no 10.100.1.3 showing as a VPN DNS server in your systemd-resolve --status command. I don't think your VPN is working correctly. Test with dnsleak.com. Try a new symlink for /etc/resolv.conf. Delete /etc/resolv.conf (sudo rm -i /etc/resolv.conf), and then sudo ln -s /run/resolvconf/resolv.conf /etc/resolv.conf. Reboot. See if it works better with and without VPN.
    – heynnema
    May 20, 2019 at 3:39
  • @heynnema no, doesn't work at all with that symlink
    – Denis Cheremisov
    May 20, 2019 at 8:23
  • @heynnema thank you very much for help BTW
    – Denis Cheremisov
    May 20, 2019 at 11:17

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