Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have Ubuntu 10.04 installed on my desktop computer which has a device with a fixed address connected to a gigabit port which has a fixed address assigned to it. They happily communicate. Now I am trying to get the same application running on a ThinkPad T61 with the same device. I have Ubuntu 10.04.2 loaded on the T61. The ethernet port on the T61 communicates nicely with a router using DHCP. However, when I try assigning a fixed address the ethernet interface becomes inactive. I have tried editing the file /etc/network/interfaces to include appropriate information for having eth0 have a fixed address. That doesn't work. I am looking for some fresh ideas.

share|improve this question
What was/is the contents of /etc/network/interfaces and is there any information from the dmesg command, you can post the files and debug info on Does the command sudo ifconfig eth0 netmask fix the problem?? of cause you need to use appropriate ip/netmask for your network. – LassePoulsen Jul 21 '11 at 22:17

you mean a static ip address? what happens when you do..

ifconfig eth0 down

ifconfig eth0 up
share|improve this answer
Nothing happens. – Allen Jul 19 '11 at 13:34

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.