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Running Ubuntu 9.04 fully patched on a custom machine. My typical setup is to assign static IP's to all my machines in the network (simplifies things with the other hardware). This morning, my machine was doing fine and I was able to get out and about just fine, Didn't make any configuration changes then. Tonight, after I got home from work, I can't resolve domain names on my box, but I can get directly to IP addresses. When I switch from using a static IP to DHCP, domain names resolve again and I can get out everywhere. Does anyone know what would have changed to stop resolving domains, and how I can fix it so I can use static again? Thanks.

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  • Ok, I'll have to try these as soon as I get home.
    – Tom A
    Commented Sep 2, 2009 at 15:18
  • I had the same problem although I didn't have a static-IP, the accepted solution (to use OpenDNS) worked for me. Thanks!
    – Sverre Rabbelier
    Commented Oct 13, 2009 at 16:37

4 Answers 4

Reset to default
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System > Preferences > Network Connections > Edit > IPx4 Settings > DNS Servers. Whatever is placed there, it does not work, maybe because your ISP started blocking external DNS traffic. Try to put there addresses of the OpenDNS nameservers, that is "208.67.222.222, 208.67.220.220" without the quotes.

Does it help?

Another option is that the avahi daemon stopped working

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  • The nameservers did it. Actually sped up my response time too. Thanks everyone.
    – Tom A
    Commented Sep 3, 2009 at 2:50
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it seems to be a DNS problem,try OpenDNS

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  • OpenDNS appears to be a proxy service. How would this solve a dns resolution issue? If it were my wife's windows box, I could do a tcp/ip reset with the netsh command, but I don't know of a linux version.
    – Tom A
    Commented Sep 2, 2009 at 4:25
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    no,they provide DNS servers,you can use them instead of your router's
    – Mahmoud Hossam
    Commented Sep 2, 2009 at 6:40
  • Bad idea, they are lying DNS resolvers, which modify the legitimate responses (for instance to direct you to advertisments).
    – bortzmeyer
    Commented Sep 3, 2009 at 7:11
  • they do not do that,by the way advertisements haven't changed when i used their DNS's
    – Mahmoud Hossam
    Commented Sep 3, 2009 at 15:59
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Try using the Google-dns server.

IP's are 8.8.4.4 and 8.8.8.8, these work for me with arch Linux.

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When you say "all my machines in the network",
it seems you are referring to a local network at your home.
If that is correct interpretation, using static IP addresses in this network
that resolve on hostname (any common domain) requires setting up the "/etc/hosts" file.

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  • have two computers, printer, ps2, and cell phones all connecting to the internal network. everything with web browsers except my computer works just fine, not sure why ubuntu would need the hosts file set up since it's been running straight for a week without reboot and started sometime today during the day.
    – Tom A
    Commented Sep 2, 2009 at 4:27

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