1

Edit:

My problem is that I cannot connect to the internet over my ethernet connection. When I run wget http://google.com, I get the error ...failed: Name or service not known. Chrome and Firefox cannot load any sites citing connection problems.

The ethernet works fine when I plug in other computers. It's this specific machine that's not working.

Edit 2 per comments from chili555

soverton@osr-ubuntu-2:~$ wget --spider http://google.com
Spider mode enabled. Check if remote file exists.
--2018-03-03 08:39:00--  http://google.com/
Resolving google.com (google.com)... failed: Name or service not known.
wget: unable to resolve host address ‘google.com’
soverton@osr-ubuntu-2:~$ ping -c3 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.56 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.69 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=1.66 ms

--- 192.168.1.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 1.568/1.642/1.695/0.071 ms
soverton@osr-ubuntu-2:~$ ping -c3 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=56 time=23.3 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=56 time=12.3 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=56 time=11.7 ms

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 11.742/15.840/23.394/5.349 ms
soverton@osr-ubuntu-2:~$ systemd-resolve --status
Global
         DNS Servers: 192.168.1.1
          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

lines 8-30
                      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 2 (enp0s25)
lines 8-31
                      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 2 (enp0s25)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
lines 8-32

                      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 2 (enp0s25)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
lines 8-33
                      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 2 (enp0s25)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 192.168.1.1
~
lines 8-37/37 (END)

                      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 2 (enp0s25)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 192.168.1.1
~
~
lines 8-37/37 (END)
                      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 2 (enp0s25)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 192.168.1.1
                      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 2 (enp0s25)
      Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 192.168.1.1

Edit 3

It's clearly a DNS lookup problem.

I found the IP address of google.com on another machine. 

ping -c3 172.217.11.142

works with pings around 40 ms.

When I run nslookup google.com, I get ;; connection timed ou; no servers could be reached

I attempted the solution here and here using DHCP and static to no benefit.

I first attempted with DHCP, then static

soverton@osr-ubuntu-2:~$ sudo ifdown enp0s25 && sudo ifp -v enp0s25
ifdown: interface enp0s25 not configured
sudo: ifp: command not found
soverton@osr-ubuntu-2:~$ sudo ifdown enp0s25 && sudo ifup -v enp0s25
ifdown: interface enp0s25 not configured

Configuring interface enp0s25=enp0s25 (inet)
/bin/run-parts --exit-on-error --verbose /etc/network/if-pre-up.d
run-parts: executing /etc/network/if-pre-up.d/ethtool
run-parts: executing /etc/network/if-pre-up.d/wireless-tools
run-parts: executing /etc/network/if-pre-up.d/wpasupplicant

/sbin/dhclient -1 -v -pf /run/dhclient.enp0s25.pid -lf /var/lib/dhcp/dhclient.enp0s25.leases -I -df /var/lib/dhcp/dhclient6.enp0s25.leases enp0s25  
Internet Systems Consortium DHCP Client 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/enp0s25/5c:f9:dd:70:17:f6
Sending on   LPF/enp0s25/5c:f9:dd:70:17:f6
Sending on   Socket/fallback
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 3 (xid=0xe91bd312)
DHCPREQUEST of 192.168.1.10 on enp0s25 to 255.255.255.255 port 67 (xid=0x12d31be9)
DHCPOFFER of 192.168.1.10 from 192.168.1.1
DHCPACK of 192.168.1.10 from 192.168.1.1
bound to 192.168.1.10 -- renewal in 42067 seconds.
/bin/run-parts --exit-on-error --verbose /etc/network/if-up.d
run-parts: executing /etc/network/if-up.d/000resolvconf
run-parts: executing /etc/network/if-up.d/avahi-autoipd
run-parts: executing /etc/network/if-up.d/avahi-daemon
run-parts: executing /etc/network/if-up.d/ethtool
run-parts: executing /etc/network/if-up.d/wpasupplicant
soverton@osr-ubuntu-2:~$ sudo nano /etc/network/interfaces #use static
soverton@osr-ubuntu-2:~$ sudo ifdown enp0s25 && sudo ifup -v enp0s25
RTNETLINK answers: No such process
RTNETLINK answers: Cannot assign requested address

Configuring interface enp0s25=enp0s25 (inet)
/bin/run-parts --exit-on-error --verbose /etc/network/if-pre-up.d
run-parts: executing /etc/network/if-pre-up.d/ethtool
run-parts: executing /etc/network/if-pre-up.d/wireless-tools
run-parts: executing /etc/network/if-pre-up.d/wpasupplicant
/bin/ip addr add 10.10.0.20/255.255.255.0 broadcast 10.10.0.255       dev enp0s25 label enp0s25
/bin/ip link set dev enp0s25   up
 /bin/ip route add default via 10.10.0.10  dev enp0s25 onlink 
/bin/run-parts --exit-on-error --verbose /etc/network/if-up.d
run-parts: executing /etc/network/if-up.d/000resolvconf
/etc/resolvconf/update.d/libc: Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf
run-parts: executing /etc/network/if-up.d/avahi-autoipd
run-parts: executing /etc/network/if-up.d/avahi-daemon
run-parts: executing /etc/network/if-up.d/ethtool
run-parts: executing /etc/network/if-up.d/wpasupplicant
soverton@osr-ubuntu-2:~$ nslookup google.com
;; connection timed out; no servers could be reached

Original post

I upgraded from 16.04 to 17.10 last night. Even before the reboot, the ethernet stopped working. When I go to the Network Manager and click "Auto ethernet", I see an image like this one pop up: connected

and it immediately disconnects, similar to this image disconnects

I've dug through many related posts, but none of the solutions worked for me.

sudo nano /etc/NetworkManager/NetworkManager.conf

Edited to

[ifupdown] managed=true

sudo service network-manager restart  #issue not resolved

Show my managed/unmanaged connections

nmcli d

DEVICE TYPE STATE CONNECTION
enp0s25 ethernet connectd Wired connection 1
lo loopback unmanaged

sudo nano /etc/network/interfaces

Edited to

auto lo
iface lo inet loopback

Restart network manager, still doesn't work

ifconfig

(I'm having to manually type this, I'm skipping over addresses)
enp0s25: flags=4163<UP, BROADCAST,RUNNING,MULTICAST> mtu 1500
     inet 192.168.1.8 netmask 255.255.255.0 broadcast 192.168.1.255
     inet6 fe80::5e1d:5c8:3898:bf5b  prefixlen 64  scopeid 0x20<link>
     ether .... txqueuelen 1000 (Ethernet)
     RX packets 10591 bytes 964576 (964.5 KB)
     RX errors 0  dropped 0  overruns 0  frame 0
     TX packets 2499  bytes 258409 (258.4 KB)
     TX errors 0  dropped 0 overruns 0 carrier 0  collisions 0
     device interrupt 20  memory ......

lo:  flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
     inet 127.0.0.1  netmask 255.0.0.0
     inet6  ::1  prefexlen 128  scopeid 0x10<host>
     loop  txqueuelen 1000 (Local Loopback)
     RX packets 17472  bytes 1624396 (1.6 MB)
     RX errors 0  dropped 0  overruns 0  frame 0
     TX packets 17472  bytes 162396 (1.6 MB)
     TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lsb_release -a confirms I'm running 17.10

Shaun Overton
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  • We are confused. Your title refers to ethernet. Your posts discusses wireless that immediately disconnects. Then your ifconfig clearly shows the ethernet has an IP address, and is receiving and transmitting packets, suggesting that it's working perfectly. What, exactly, is the problem? – chili555 Mar 03 '18 at 14:20
  • When I open Chrome or Firefox, it can't open anything. If I run wget http://google.com, it says failed: Name or service not known. – Shaun Overton Mar 03 '18 at 14:37
  • Is your problem wireless or ethernet??? – chili555 Mar 03 '18 at 14:38
  • Please edit your question to add the result of these terminal commands: ping -c3 192.168.1.1 also: ping -c3 8.8.8.8 also: systemd-resolve --status – chili555 Mar 03 '18 at 14:51

1 Answers1

0
sudo dpkg-reconfigure resolveconf

I discovered the answer here.

A friendly hat tip to chili555 for guiding me to the resolution.

Shaun Overton
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