Machine ID

https://man7.org/linux/man-pages/man5/machine-id.5.html

• Located at /etc/machine-id
• Can be regnerated with systemd-machine-id-setup

Troubleshooting

Cloning a virtual machine keeps the same IP on DHCP!

If you’re configuring your machine’s network with /etc/systemd/network as in…

[Match]
Name=enp0s5

[Network]
DHCP=yes
MulticastDNS=yes

The issue is likely due to systemd-networkd’s DHCP client using the same machine-id or DUID (DHCP Unique Identifier) on both cloned machines, causing the DHCP server to assign them the same IP address.

sudo rm /etc/machine-id
sudo systemd-machine-id-setup
sudo systemctl restart systemd-networkd