this post was submitted on 29 May 2026
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Hi, I have a Proxmox server with 2x debian trixie VMs (one was cloned from the other). On a seperate box i have pfsense which acts as router, firewall and DHCP server. The DHCP server dishes out IPs to my network based on my list of mac addresses filled in against specific IPs. For example, all my computers get the 192.168.1.2x range, my phones the 192.168.1.3x and so on. I assigned the mac addresses on the two VMs to the 192.168.1.9x range but they are misbehaving. One seems to always hook up to 192.168.1.106 while the other will hook up to a 172.x.x.x address if the first is also running. If the first VM is off, then it too will hook up to 192.168.1.106. There is no other dhcp server on my network so how can the second vm hook up to a 172.x.x.x address? Also, any clues on why the vms are misbehaving? Is this something to do with the bridge on the proxmox hosting machine?

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[–] mlfh@lm.mlfh.org 3 points 1 week ago* (last edited 1 week ago) (1 children)

Looks like both of your vms probably have the same mac address - the 172 ip address is likely a self-assigned fallback when the dhcp server replies to the second vm that it can't give it an address. Double-check and make sure the mac address in each vm's proxmox network adapter settings match your pfsense dhcp reservations, and let me know if that resolves it.

A 172.16.0.0/12 address would be a very unusual fallback behavior. Normally you'll have only a 169.254.0.0/16.