DaniWeb IT Discussion Community - View Single Post - Change DNS from DHCP to static in Ubuntu

Re: Change DNS from DHCP to static in Ubuntu

Nov 18th, 2008

•

Originally Posted by eggi

Hey there,

It sounds like you want to change ethernet settings and reset your DNS.

For DNS, the easiest way would be to create an additonal resolv.conf - /etc/resolv.conf.static or something like that - and backup your current resolv.conf and copy that one over it.

For your ethernet address, you should be able to do something close to the following (setting up a file in /etc/network/interfaces would make this easier, but not as easy to explain

Assuming eth0

ifdown eth0
ifconfig eth0 10.10.10.10 netmask 255.255.255.0 up

should do it - just change 10.10.10.10 to your static IP and replace the 255.255.255.0 subnet mask with whatever is appropriate for your system.

Hope that helps

, Mike

Thanks for the reply.
Actually, the only thing I want to change is my DNS IP.
Here's the scenario. I have Ubuntu 8.10 running on my Dell Mini 9 and I take this machine everywhere. At home I have DHCP setup with my router serving OpenDNS as my DNS for all of my client machines on my LAN. When I leave my house, when I go to a wifi hotspot, like Starbucks or whatever, I would like to continue to use OpenDNS IP's as my DNS servers.
So, when I enter the wifi hotspot, I would like to launch a script on my desktop to automatically change my DNS IPs from the IPs that were given to me by that public wifi to the OpenDNS IPs instead.
Is that possible? Should I just create a script to rename that resolve.conf file every time I want to use a static DNS IP?
Thanks in advance.

-----------------------------------
http://www.edwardcrosby.com
http://www.theuniquegeek.com