Last week, I upgraded my operating system to Ubuntu 12.10 from 12.04, and the internet stopped working on two virtual machines (launched with virtualbox), Windows XP and OSX Snow Leopard. OSX also stopped working completely at first, but I fixed that by switching to the 64 bit option in the vbox settings. I switching to bridged networking from NAT restored the internet to Windows, but not to OSX. Does anybody know what I could be doing wrong?


From Ubuntu 12.04 dns name resolve changed so that you should add "dns-nameservers" parameter to your /etc/network/interfaces file, like :

  • Thanks! Once I got the adapter back to "Intel PRO/1000 T Server (82543GC) and Vbox back to 4.1, this worked like a charm! – user100607 Oct 30 '12 at 5:17

I had exectly same issue. You need to upgrade the VirtualBox to 4.2.X (that helped me)

Add one of the following lines according to your distribution to your /etc/apt/sources.list:

deb http://download.virtualbox.org/virtualbox/debian precise contrib


wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install virtualbox-4.2

More about installation and post install steps you can read here: https://www.virtualbox.org/wiki/Linux_Downloads

  • I tried this, but with 4.2 my Vbox lost the ability to load OSX. This may be because my hardware is mac, but my host OS is ubuntu. Thanks for trying, though. On the plus side, while it was in 4.2, Windows seemed to run better. – user100607 Oct 30 '12 at 5:07
  • I had this same problem, and this fixed it perfectly for me. In fact, it also fixed another problem I was having with Windows 3.11 displaying stretched when I increased the resolution. – Dan Jones Dec 12 '12 at 17:28

As per thread here http://ubuntuforums.org/showthread.php?t=2049230

sudo apt-get install dnsmasq

solved the issue for me

  • Thank you so much! This worked perfectly for me on Xubuntu 12.10. – functionptr Feb 23 '13 at 3:05

First check how is network configured in guests if its DHCP then probably they don't get DNS servers from host as after update Virualbox has no runing DNS service for nated guests thus they can't resolve hostnames.

There are two solutions 1) Setup guest mashines to use as DNS servers or recofigure Virtualbox to provide DNS proxy service

VBoxManage modifyvm "VM name" --natdnsproxy1 on 


VBoxManage modifyvm "VM name" --natdnshostresolver1 on

Changing DNS server config in guests works for me the other solution might work (acording to VBox documentation) havent tested it myself


I was having the same problem. Using 12.10 as a host and running Windows Vista as a guest. The following solved the problem:

VBoxManage modifyvm global --natdnshostresolver1 on

Source: https://forums.virtualbox.org/viewtopic.php?f=26&t=50387


I have been struggling with no network connection since upgrade to 12.10. I was getting the "DNS server is not responding" message.

sudo apt-get install dnsmasq

solved the issue for me as well.


Personally, none of the above solutions worked out in my case.

However, the following command, found here, made my day:

vboxmanage modifyvm "Your VM Name" --natdnshostresolver1 on

Hope that helps,

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