Ubuntu – the proper way to change the DNS IP

dnsnetwork-manager

I suspect that the name server provided by my ADSL modem/router is buggy. Whenever I browse to a website for the first time in ubuntu, resolving the domain name takes at least 15 seconds.

To work around that problem, I changed the nameserver configuration in /etc/resolv.conf from 192.168.1.1 (my ADSL modem) to 8.8.8.8 (google's primary DNS). This seems to fix the problem, but unfortunately my changes to /etc/resolv.conf are overwritten by "NetworkManager" at each startup.

What is the proper way to configure the name server IP in ubuntu 10.4?

Best Answer

If you have typical connection setup with the network manager and DHCP, try the following:

Right click on the network manager icon in the panel and choose "Edit connections..."
Select your connection from the wired or wireless tab, choose "Edit"
(Enter your password if the connection is set as "system-wide available")
Choose IPv4 settings tab
Switch method to "Automatic (DHCP) addresses only"
Enter the name server you want in the box "Additional DNS servers" and press "Apply"

That should do the trick.

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A work around to solve this is to temporarily add the domains you need to the /etc/hosts file.

That provided enough connectivity to sudo aptitude to resolve the broken dependencies on the system.

After the upgrade, Ubuntu rebooted normally and I could remove the static IPs from the hosts file again.

I used the following to capture the domains I needed to update and put them into a text file: sudo apt-get update >> domains.txt

I used the following to grab the IPs I needed:

sh domain-nslookup.sh >> apt-domains.txt

The following is the sh file I created and saved as domain-nslookup.sh:

#!/bin/sh
for DOM in `cat ./apt-domains.txt`;
do
    nslookup $DOM 8.8.8.8 |gawk -F": " '/Address/{print $2}'
    printf "\t%-4s" $DOM
done
printf "\n"

After verifying that it worked as planned, I added the IPs and domains to the hosts file:

sudo sh domain-nslookup.sh >> hosts

Best Answer

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