diff --git a/ansible/roles/bhyve/files/bhyve_netgraph_bridge.bash b/ansible/roles/bhyve/files/bhyve_netgraph_bridge.bash
index 8760c30..c009737 100644
--- a/ansible/roles/bhyve/files/bhyve_netgraph_bridge.bash
+++ b/ansible/roles/bhyve/files/bhyve_netgraph_bridge.bash
@@ -21,16 +21,22 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 #   doas bhyve_netgraph_bridge start poudriere zdata/vm/poudriere /vm/poudriere jail_nat 10.215.1.1/24 /vm/iso/FreeBSD-13.2-RELEASE-amd64-bootonly.iso
 #   doas bhyve_netgraph_bridge start poudriere zdata/vm/poudriere /vm/poudriere jail_nat 10.215.1.1/24
 
+: ${CPU_CORES:="1"}
+: ${MEMORY:="1G"}
+: ${NETWORK:="NAT"} # or RAW
+: ${IP_RANGE:="10.215.1.1/24"} # Ignored for RAW networks
+: ${INTERFACE_NAME:="jail_nat"} # or the external interface like lagg0 for RAW networks
+: ${BRIDGE_NAME:="bridge_$INTERFACE_NAME"} # or bridge_raw for RAW networks
+
 function main {
-    if [ "$1" = "create-disk" ]; then
-        shift 1
+    cmd="$1"
+    shift 1
+    if [ "$cmd" = "create-disk" ]; then
         create_disk "${@}"
-    elif [ "$1" = "start" ]; then
-        shift 1
+    elif [ "$cmd" = "start" ]; then
         start_vm "${@}"
     else
-        >&2 echo "Unrecognized command"
-        exit 1
+        die 1 "Unrecognized command $cmd"
     fi
 }
 
@@ -48,9 +54,12 @@ function create_disk {
     zfs create -o "mountpoint=$mount_path" "$zfs_path"
     cp /usr/local/share/edk2-bhyve/BHYVE_UEFI_VARS.fd "${mount_path}/"
     tee "${mount_path}/settings" <<EOF
-CPU_CORES=1
-MEMORY=1G
-NETWORK=NAT
+CPU_CORES="$CPU_CORES"
+MEMORY="$MEMORY"
+NETWORK="$NETWORK"
+IP_RANGE="$IP_RANGE"
+BRIDGE_NAME="$BRIDGE_NAME"
+INTERFACE_NAME="$INTERFACE_NAME"
 EOF
     zfs create -s "-V${gigabytes}G" -o volmode=dev "$zfs_path/disk0"
 }
@@ -59,20 +68,19 @@ function start_vm {
     name="$1"
     zfs_path="$2"
     mount_path="$3"
-    host_interface_name="$4" # for raw, external interface
-    bridge_name="bridge_${host_interface_name}"
-    ip_range="$5" # for raw this value does not matter
-    mount_cd="${6:-}"
+    mount_cd="${4:-}"
 
-    mac_address=$(calculate_mac_address "$name")
-
-    CPU_CORES=1
-    MEMORY=1G
-    NETWORK="NAT"
     if [ -e "${mount_path}/settings" ]; then
         source "${mount_path}/settings"
     fi
 
+    host_interface_name="$INTERFACE_NAME" # for raw, external interface
+    bridge_name="$BRIDGE_NAME"
+    ip_range="$IP_RANGE" # for raw this value does not matter
+
+    mac_address=$(calculate_mac_address "$name")
+
+
     if [ "$NETWORK" = "NAT" ]; then
         assert_bridge "$host_interface_name" "$bridge_name" "$ip_range"
     elif [ "$NETWORK" = "RAW" ]; then