Thanks in advance for reading this question! I just installed Ubuntu Server (CLI only) 16.04.3 LTS on my Dell Inspiron with a Centrino 2. I have a wired connection to my router, but I can't ping it or any other device on the network, nor can I ping any Google server. Attempting to ping anything other than the loopback interface yields "Destination Host Unreachable." I think it's a problem with the way I've configured my interfaces, but I can't be sure. I have added the output of ip and my routing table below:

ip addr show enp9s0

2: enp9s0: <N0-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether <MAC address> brd ff:ff:ff:ff:ff:ff
inet brd scope global enp9s0
valid_lft forever preferred_lft forever

route -n

Kernel IP routing table
Destination    Gateway        Genmask        Flags Metric Ref    Use Iface        UG    0      0        0 enp9s0  U     0      0        0 enp9s0

AFAIK, these are correct, right? But my experience with networking is pretty limited, so they could also be wrong in some way that I didn't anticipate. The interface enp9s0 is my wired Ethernet controller, and I have it configured to have a static IP. I have confirmed that there are no IP conflicts with other devices on the LAN. Just in case it might help, here is my /etc/network/interfaces

auto lo
iface lo inet loopback

auto enp9s0
iface enp9s0 inet static


Thanks in advance for any help that you can provide!

edit 1:

This morning I checked the BIOS settings regarding both network interfaces. Just to be sure, I toggled them with a boot in between, and they had no effect. On a whim, I decided to boot into a live Ubuntu desktop, only to find that the wireless interface works exactly as it should, but the Ethernet interface still does not. I think that the problems with the wireless interface stem from not having the wpasupplicant package installed. Unfortunately, this package isn't preexisting on the Server distribution, and I can't install it without attempting some serious apt hackery. The Ethernet interface not working is a bit concerning, though...perhaps a driver issue? or an unseen hardware issue? No matter what I try, I can't seem to get the state UP.

  • 2
    Can you ping your enp9s0 interface ping -c 3 – M. Dm. Jan 8 '18 at 15:39
  • Hey, thank you for responding! I can, yes. I hadn't thought of trying that. Pinging the enp9s0 interface seems to work. – EDTwardy Jan 8 '18 at 16:24
  • So, the interface is up. Can you trace the route to the gateway for example traceroute It looks silly but may give us additional information about your problem. – M. Dm. Jan 8 '18 at 16:36
  • It looks like I only have tracepath. I hope that this will also be useful? tracepath -b gives: 1?: [LOCALHOST] pmtu 1500 1: ( 1434.933ms !H Resume: pmtu 1500 – EDTwardy Jan 8 '18 at 17:03
  • Couldn't help but notice your interface is listed as DOWN. Have you checked your cable/router/interfaces? – The Pizza Overlord Jan 8 '18 at 17:41

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