diff --git a/openmptcprouter/files/etc/uci-defaults/1920-omr-network b/openmptcprouter/files/etc/uci-defaults/1920-omr-network
index ef722926a..c8be3490a 100755
--- a/openmptcprouter/files/etc/uci-defaults/1920-omr-network
+++ b/openmptcprouter/files/etc/uci-defaults/1920-omr-network
@@ -27,7 +27,7 @@ _setup_macvlan() {
 	set network.$1.masterintf=$_ifname
 	EOF
 	_macaddr=$(uci -q get "network.$1.macaddr")
-	_setup_macaddr "$1_dev" "${_macaddr:-auto$(date +%s)}"
+	_setup_macaddr "$1_dev" "${_macaddr:-$(dd if=/dev/urandom bs=1024 count=1 2>/dev/null | md5sum | sed -e 's/^\(..\)\(..\)\(..\)\(..\)\(..\)\(..\).*$/\1:\2:\3:\4:\5:\6/' -e 's/^\(.\)[13579bdf]/\10/')}"
 }
 
 #_setup_macvlan_update() {