utmapp
Bridge network guest receiving same ip address from external dhcp server
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Describe the issue
When I configure
- Two guests with bridge networking
- Both guests have cloud-init installed and dhcp on the first interface
When booting both machines, both receive the same IP address from the dhcp server! 😅 The MAC address of the network cards is different inside of UTM.
Configuration
- UTM Version: 4.6.4
- macOS Version: 15.2
- Mac Chip (Intel, M1, ...): M2 Pro
Could be related to me using the WiFi adapter instead of the ethernet adapter as mentioned here https://superuser.com/questions/1269435/vm-guest-getting-assigned-same-ip-as-host-when-using-bridge-adapter.
Changing from WiFi to the host adapter for the bridge interface (and rotating the MAC addresses) didn't help unfortunately. Both still get the same IP 🤔
I'm also running into this trying to run two Ubuntu VMs on macOS. Each has a unique MAC address and is configured to bridge from the Mac's Ethernet card.
Well, it turns out to be caused by conflicting /etc/machine-id in case of cloned VMs. Edit the last digit of your clone's machine-id, and DHCP works.
When creating bento vagrant boxes we have to cleanup the machine-id on ubuntu before ending the image creation otherwise cloning the image to multiple vm's will create dhcp IP issues. https://github.com/chef/bento/blob/main/packer_templates/scripts/ubuntu/cleanup_ubuntu.sh#L92
