Use statically-generated mac addresses.

ansible/roles/bhyve/files/bhyve_netgraph_bridge.bash

@@ -38,6 +38,8 @@ function start_vm {
     bridge_name="bridge_${host_interface_name}"
     ip_range="$5"
 
+    mac_address=$(calculate_mac_address "$name")
+
     assert_bridge "$host_interface_name" "$bridge_name" "$ip_range"
     bridge_link_name=$(detect_available_link "${bridge_name}")
 
@@ -60,7 +62,8 @@ function start_vm {
             -H \
             -s 0,hostbridge \
             -s "4,nvme,/dev/zvol/${zfs_path}/disk0" \
-            -s "2:0,virtio-net,netgraph,path=${bridge_name}:,peerhook=${bridge_link_name}" \
+            -s "2:0,virtio-net,netgraph,path=${bridge_name}:,peerhook=${bridge_link_name},mac=${mac_address}" \
+            -s 3,ahci-cd,/vm/.iso/archlinux-2023.04.01-x86_64.iso \
             -s 29,fbuf,tcp=0.0.0.0:5900,w=1920,h=1080 \
             -s 30,xhci,tablet \
             -s 31,lpc -l com1,stdio \
@@ -129,5 +132,11 @@ function ng_exists {
     ngctl status "${1}" >/dev/null 2>&1
 }
 
+function calculate_mac_address {
+    name="$1"
+    source=$(md5 -r -s "$name" | awk '{print $1}')
+    echo "${source:0:2}:${source:2:2}:${source:4:2}:${source:6:2}:${source:8:2}:${source:10:2}"
+}
+
 
 main "${@}"