diff --git a/viirb-1-connect-flash-latest-openwrt.sh b/viirb-1-connect-flash-latest-openwrt.sh
index 28ba121..c551ef1 100755
--- a/viirb-1-connect-flash-latest-openwrt.sh
+++ b/viirb-1-connect-flash-latest-openwrt.sh
@@ -2,24 +2,33 @@
 # 2020-06-13, Nico Schottelius
 # See https://ungleich.ch/u/products/viirb-ipv6-box/
 
-if [ $# -ne 1 ]; then
-    echo "$0 interface"
+if [ $# -lt 1 ]; then
+    echo "$0 interface [address]"
     echo "    interface to add the config ip address to"
+    echo "    address: connect to this address, ignore the interface"
     exit 1
 fi
 
 set -x
 dev=$1; shift
 
+if [ $# -ge 1 ]; then
+    viirb_ip=$1; shift
+    dev=""
+else
+    viirb_ip=192.168.61.1
+fi
+
 # openwrt
 version=19.07.3
 filename=openwrt-${version}-ramips-mt76x8-vocore2-squashfs-sysupgrade.bin
 
 # IP address for setting it up initially
-viirb_ip=192.168.61.1
 
-sudo ip addr del 192.168.61.2/24 dev "$dev" 2>/dev/null || true
-sudo ip addr add 192.168.61.2/24 dev "$dev"
+if [ "$dev" ]; then
+    sudo ip addr del 192.168.61.2/24 dev "$dev" 2>/dev/null || true
+    sudo ip addr add 192.168.61.2/24 dev "$dev"
+fi
 
 # don't care about other/old known_host entries
 ssh-keygen  -R ${viirb_ip}