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+
+attach-interface - unexpected action
+
+Hello,
+
+Not sure where to report this, or if it is a bug. However, I feel like the behaviour is not what would/should be expected.
+
+----------------------------------------------------------------------------------------------------------
+
+Environment:
+KVM Version:		root@hostname:~# virsh version
+      			Compiled against library: libvirt 1.2.9
+			Using library: libvirt 1.2.9
+			Using API: QEMU 1.2.9
+			Running hypervisor: QEMU 2.1.2
+uname -a:		Linux hostname 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) x86_64 GNU/Linux
+CPU:			Intel(R) Xeon(R) CPU E3-1240 V2 @ 3.40GHz
+Host Debian Version:	8.7 (Jessie)
+Guest Debian Version:	8.7 (Jessie)
+
+----------------------------------------------------------------------------------------------------------
+
+Issue:
+When adding an interface to a live VM, the position of interfaces within the VM may change post reboot.
+It appears a new interface takes up the first available “pci slot”. If you have removed an interface in the past, this will be the one that is taken up.
+
+----------------------------------------------------------------------------------------------------------
+
+Example:
+
+If the VM Has the following interfaces layout:
+
+eth0  HWaddr 00:00:00:00:00:00
+eth1  HWaddr 11:11:11:11:11:11
+eth2  HWaddr 22:22:22:22:22:22
+eth3  HWaddr 33:33:33:33:33:33
+
+Now I delete the interface with MAC address 11:11:11:11:11:11, you now have this:
+
+eth0  HWaddr 00:00:00:00:00:00
+eth1  HWaddr 22:22:22:22:22:22
+eth2  HWaddr 33:33:33:33:33:33
+
+And then you add a new interface with MAC address 44:44:44:44:44:44, using virsh:
+
+virsh attach-interface --domain guest --type bridge --source br3 --mac 44:44:44:44:44:44 --model e1000 --target vmeth3 --live --persistent
+
+It will now look like this:
+
+eth0  HWaddr 00:00:00:00:00:00
+eth1  HWaddr 22:22:22:22:22:22
+eth2  HWaddr 33:33:33:33:33:33
+eth3  HWaddr 44:44:44:44:44:44
+
+However, after a reboot, it will look like this:
+
+eth0  HWaddr 00:00:00:00:00:00
+eth1  HWaddr 44:44:44:44:44:44
+eth2  HWaddr 22:22:22:22:22:22
+eth3  HWaddr 33:33:33:33:33:33 
+
+This can be a problem, as /etc/network/interfaces file, etc., will be pointing to the wrong interfaces. I.E. originally eth1 was connected to br1 (for example), after reboot eth1 is now connected to br3.
+
+To resolve this issue, I need to edit the .xml file in the KVM machine, and edit the following lines:
+
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x0c' function='0x0'/>
+
+Changing these into the order I want them to be loaded in, i.e. eth0, eth1, eth2…. (I know 4 are taken already and not usable by ethernet interfaces.)
+
+----------------------------------------------------------------------------------------------------------
+
+
+Thanks in advance.
+
+Kind regards,
+
+Aaron Doyle
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