Hi, so I have a little Proxmox box with two VMs: VM1 and VM2 which is a clone of VM1. I change the mac of VM2 to avoid conflict and I reset the machine ID of VM1. I then have a seperate pfSense machine machine that that acts as router, firewall and DHCP server. Proxmox is on the 192.168.20.1/24 domain. In the DHCP server, Proxmox get IP 192.168.20.8 explicitly assigned. All good to this point. I’ve set VMs on pfSense to get the 192.168.20.9X addresses assigned. VM1 gets 192.168.20.91 assigned, while VM2 should be getting 192.168.20.92.

But this is what actually happens:

  • VM1 gets 192.168.20.106 assigned, despite telling pfSense to assign it 192.168.20.91. This happens even with VM2 shutdown. The DHCP Lease table is showing 91 up and running and does not list 106. Yet, the ARP table shows 106 assigned and no 91 assigned. This is even with me deleting the 106 entry from the ARP table several times and rebooting both the VM and the Proxmox server.

  • The VM is definately getting 106 assigned as I can log into it with 106 IP but 91 doesn’t respond (no route to host).

Is this something to do with the bridge configuration on Proxmox? Iv’e added a screenshot of what I see. It doesn’t seem to be that complicated to setup a bridge?

I can’t get my head around this so tips are welcome.

EDIT: I’ve just run ‘sudo ip’ on the VM and i see the ens18 interface with the MAC I assigned to it and the 106 IP assigned to this interface. There are then seven of ‘vethXXX’ interfaces. Not sure what these are. There are also four ‘brXXXX’ interfaces, one ‘loXXXX’ interface and one ‘docker0’ interface, the latter probably used by the docker subsystem running on the VM. I imagine the ‘brXXXX’ interfaces are the docker containers themselves (I think I have four running). But what are the ‘vethXXXX’ interfaces? Sounds like its something to do with “virtual interface”. Why so many and what is creating these?

  • SirEDCaLot@lemmy.todayEnglish
    1·
    9 hours ago

    Hmm Are you wedded to that particular Mac address? If not, shut down the VM, delete the virtual Network card, then make a new virtual Network card. Copy paste the Mac of that new card into pfsense with the static mapping, and fire up the VM. See what happens.

    If that doesn’t work, I remember something it was possible for proxmox to do some kind of routed Network system. To investigate that, delete all static mappings, fire up the VM, and just look at what Mac address it shows getting the DHCP lease. Is it the one that shows as being assigned to the VM?