This article is step-by-step tutorial how to fix a problem which occured after I restored my virtual machines from backup to my ESXI server.
[caption id="" align="aligncenter" width="658"] ifconfig when eth0 is not available[/caption]
when I used **lspci**, result was
[caption id="" align="alignnone" width="658"] lspci result[/caption]
So network adapter is correctly available in my virtual machine. As next step I need to found out which alias is used for this adapter. I didn't find any easily way than try et0,eth1,....
So, I found my network adapter. Now as last step it's necessary to update network interfaces to this adapter
[caption id="" align="alignnone" width="652"] /etc/network/interfaces[/caption]
As last step restart your machine and everything should work correctly.