On 25/03/21 5:51 am, Nicolas Kovacs wrote: > Hi, > > (tl;dr : how can I clone a KVM-based bridged virtual machine and force a > duplicate MAC address ?) > > Up until recently I've been using VirtualBox on my workstation to test various > local setups. Usually I would setup a basic CentOS installation, and whenever I > wanted to fiddle around, I would just clone that system and play around with > it. So whenever I shot myself in the foot on that VM, I would simply erase it > and start over again with a new clone. Think of it as a disposable VM. > > All my VMs under VirtualBox used bridged mode, so they were in the same > network. And in my local proxy server, I have Dnsmasq that assigns static IP > addresses and meaningful hostnames to these VMs. Here's what the corresponding > lines in dnsmasq.conf look like: > > dhcp-host=08:00:27:00:00:01,suse-lp151,192.168.2.10 > dhcp-host=08:00:27:00:00:02,suse-lp152,192.168.2.11 > dhcp-host=08:00:27:00:00:03,ce7-server,192.168.2.12 > dhcp-host=08:00:27:00:00:04,ce8-server,192.168.2.13 > dhcp-host=08:00:27:00:00:05,ol7-server,192.168.2.14 > dhcp-host=08:00:27:00:00:06,ol8-server,192.168.2.15 > dhcp-host=08:00:27:00:00:07,rh7-server,192.168.2.16 > dhcp-host=08:00:27:00:00:08,rh8-server,192.168.2.17 this appears to have 8 different mac addresses and then assigned 8 individual IP addresses - that would appear desireable and correct. Why do you want the same mac? what are you trying to achieve? Feel like I'm missing something > > Over the last two weeks, I decided to migrate from VirtualBox to KVM even for > local configurations and virtualized desktop configurations. So far, everything > works nice... except one problem I can't seem to solve (yet). > > I'm using KVM in bridged mode, over a br0 bridge on my workstation. Like with > VirtualBox, all my KVM virtual machines are part of my local 192.168.2.0/24 > network. > > Unfortunately there is no way to simply make a perfect clone of a virtual > machine using virt-manager. It insists on assigning my cloned VM a different > MAC address. And whenever I want to manually create a NIC with the same MAC > address as the original, Virtual Machine Manager tells me I can't do that. Same > player shoot again. > > Now I know that is normally a good thing. You don't want MAC address conflicts > in your network. But here's the thing: I don't intend to fire up both copies at > once. As with VirtualBox, I only intend to use one VM at a time, for testing > purposes. Now how can I "explain" this to Virtual Machine Manager without > having to jump through burning loops ? > > Cheers, > > Niki >