diff --git a/setup-tundev.sh b/setup-tundev.sh
new file mode 100755
index 0000000..70389bd
--- /dev/null
+++ b/setup-tundev.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+
+if [ -z "$1" ]; then
+	echo IP+Subnet argument required.
+	exit 1
+fi
+
+sudo ip tuntap add dev hamnet70 mode tun user $UID
+sudo ip link set dev hamnet70 up
+sudo ip addr add dev hamnet70 $1