sticky DHCP

[nick-b-1]

I notice my 192.168.64.x address changes every few days or weeks on the default networking in my MacOS UTM setup. It would be nice if these address were more sticky in that the served DHCP address wouldn't change over time unless there was a reason for it (lots of devices).

[freebrowser1]

Try using "Emulated VLAN' instead of 'Shared network'. The host always has 10.0.2.2 and guest 10.0.2.15 as seen from the guest. This works for me with both Linux and Windows guests.

[nick-b-1]

I'm only seeing "Shared Network" and "Bridged" in my network settings.

[jairov4]

I also see only shared and bridged, but even bridged is not working, which would allow me to setup it at my physical network dhcp level.

[ckujau]

Same here, for some reason the DHCP range is changed once in a while and I have to reconfigure my local setup to use the new address. This is the workaround I'm testing right now, executing the same on every boot, but I wonder how "stable" this is, or if macOS decides to change Shared_Net_Address at any time:

$ sw_vers --productVersion; uname -m; utmctl version
15.7.1
arm64
4.7.4

$ sudo defaults read /Library/Preferences/SystemConfiguration/com.apple.vmnet.plist Shared_Net_Address
192.168.67.1

$ sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.vmnet.plist Shared_Net_Address 192.168.66.1
$ sudo defaults read /Library/Preferences/SystemConfiguration/com.apple.vmnet.plist Shared_Net_Address
192.168.66.1

Starting the VM again and it receives a DHCP lease from 192.168.66.0/24. 🎉

Edit: maybe I have to do something about /var/db/dhcpd_leases, as the old (and unwanted) address is still mentioned here:

$ grep -B1 -A4 -e 192.168.67.2 -e 192.168.66.3 /var/db/dhcpd_leases 
        name=foobar
        ip_address=192.168.66.3
        hw_address=ff,49:6c:4c:6f:0:1:0:1:2f:67:7f:4c:6a:79:49:6c:4c:6f
        identifier=ff,49:6c:4c:6f:0:1:0:1:2f:67:7f:4c:6a:79:49:6c:4c:6f
        lease=0x68dfdf88
}
--
        name=foobar
        ip_address=192.168.67.2
        hw_address=ff,49:6c:4c:6f:0:1:0:1:2f:67:7f:4c:6a:79:49:6c:4c:6f
        identifier=ff,49:6c:4c:6f:0:1:0:1:2f:67:7f:4c:6a:79:49:6c:4c:6f
        lease=0x68dfdc03
}