Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

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

This question already has an answer here:

After I cloned a VirtualBox VM image, either original nor cloned Debian 6 (squeeze) image have networking works anymore.

I've read A TON of articles online describing modifying the /etc/udev/rules.d/70-persistent-net.rules and /etc/udev/rules.d/75-persistent-net-generator.rules files but none of those "fixes" worked for me.

(Apparently this is a "feature" of UDEV that causes all kinds of problems if you are using Debian/Ubuntu in a virtualized environment for development and want to clone images because it changes your MAC address of your virtual NIC).

Can someone please described exactly what I need to do in order to have networking working again in my VM debian images. Thanks

Note: networking stopped in BOTH (all) debian virtual images now. Essentially, 1 how do I fix my MAC address since I don't even know what MAC address should now be used, [2] how do I prevent this from happening in the future when I clone VM images?

UPDATE: My problem was filed as a bug with both VirtualBox and VMWare but both companies closed the tickets stating this is a "feature" of Debian. Some people suggests ways to fix the problem but none have worked.

share|improve this question

migrated from Jun 1 '11 at 18:44

This question came from our site for professional and enthusiast programmers.

marked as duplicate by Dave M, Renan, TFM, Dennis, BBlake Mar 4 '13 at 21:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

I used the following instructions: "Network stops working after a CloneVDI / VM"

It worked for me..

share|improve this answer

Have you tried changing mac address of one of your machines so they are not identical.

More details: Open virtualbox, settings, network, find network adapter and change mac adress. Just change 1 sign so mac addresses are not the same.

share|improve this answer
If what you are describing can't be done with one (or both) of the two files listed above, then no. Would you mind providing more details. – Jason7 Jun 1 '11 at 13:25
What MAC address should I use though? – Jason7 Jun 1 '11 at 15:15
The MAC address are NOT the same. That's the issue. Debian keeps automatically (dynamically) changing the virtual NIC MAC address – Jason7 Jun 1 '11 at 17:44