+++ This bug was initially created as a clone of Bug #973911 +++ Description of problem: Adding nics to a VM with the same mac should be blocked. On GUI it is blocked. Version-Release number of selected component (if applicable): si29 Additional info: 1. On 3.2 REST blocks it. 2. This was discovered when the VM was rerun, and failed on: "XML error: Attempted double use of PCI Address '0:0:3.0'" in vdsm log. --- Additional comment from Ilanit Stein on 2013-06-13 04:01:44 EDT --- Important addition: The mac of the 2nd nic added, is the same mac, but yet differ in case sensitivity! If the exact mac is given to the 2nd nic, including case sensitivity - the nic add fails (that this mac already exists...) For example if the mac is: 00:1a:4a:23:a0:db, adding a second nic with mac 00:1a:4a:23:a0:db will fail, but adding a 2nd nic with mac 00:1A:4A:23:A0:DB will succeed.