i am running ubuntustudio 14.04.

I have a development setup where my pc has 2 NICs one of which connects to the internet and acquires dhcp ip from the router, while the other (eth1) is used to connect development boards etc. Now, on eth1 I have a dhcp server running for that "development intranet" and I want to have a static ip address on this interface.

The problem is that dhcp server fails to start executing and the reason is that eth1 does not have the ip that I have set through the NetworkManager. Checking with ifconfig:

eth1      Link encap:Ethernet  HWaddr 10:fe:ed:05:99:21  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

I have done the following:

  • sudo vi /etc/NetworkManager/NetworkManager.conf switched managed to true.
  • tried through NetworkManager to setup enter image description here eth1, but it is disabled as you can see.
  • I went on to create a new interface based on eth1, the one you see named as Ethernet Connection 1. enter image description here

the system does not get ipaddress through network manager, whether I have the cable unplugged, or plugs. By the way, I strongly prefer the former.

I wonder if i'll make my life more difficult if I disable network manager altogether and just write the ipaddress in `/etc/network/interfaces/ file. It is a desktop after all.

Have I missed something in order to make NetworkManager assign the static ip permanently from boot to shutdoown??

thank you

1 Answer 1


NetworkManager will override dhcp settings, overwriting resolv.conf even if you've configured DNS in /etc/dhcp/dhclient.conf, e.g. causing DNS to first search the local domain, which may have to time out before DNS resolution continues causing lengthy DNS resolution times.

Test this:

Uninstall it

sudo su
apt-get remove --purge networkmanager*

Configure the interface manually

sudo su 
nano /etc/network/interfaces

Example file

auto lo
iface lo inet loopback

auto eth0
    allow-hotplug eth0
    iface eth0 inet dhcp

auto eth1
    iface eth1 inet static
  • hi there, I do not refer to dhcp client anywhere, nor resolv.conf. still you basically advice (even though not tell explicitly) to remove networkManager. will that brake my desktop's network connections in anyway I have not thought of ?
    – nass
    Aug 28, 2014 at 13:26

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