ERROR while getting interface flags: No such device
I've been doing some experiments with VMWare Server and Ubuntu Server. After copying a VM all the NICs from the new VM disappeared (kept getting "ERROR while getting interface flags: No such device" when I did ifup eth0. I found the solution here.
From http://ephemeralvalue.com/?p=23:
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Cloning Ubuntu Server 7.10 on VMware ESX
After cloning a virtual machine running Ubuntu Server 7.10 I found that it didn’t have any network available. Restarting networking gave:
sudo /etc/init.d/networking restart
* Reconfiguring network interfaces...
eth0: ERROR while getting interface flags: No such device
SIOCSIFADDR: No such device
eth0: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device
SIOCSIFBRDADDR: No such device
eth0: ERROR while getting interface flags: No such device
eth0: ERROR while getting interface flags: No such device
Failed to bring up eth0.
The problem lies in the fact that ethernet MAC addresses are cached. You need to remove a file to clear the cached value:
sudo rm /etc/udev/rules.d/70-persistent-net.rules
After a restart of your server you should have networking back again.
I also had to edit the following files to change the static ip addresses and hostname:
/etc/hosts- change ip address and hostnames/etc/hostname- change hostname/etc/network/interfaces- change ip address