diff --git a/docs/deployment.png b/docs/deployment.png
index 0fc06d14..79d00082 100644
Binary files a/docs/deployment.png and b/docs/deployment.png differ
diff --git a/docs/virtual-network.png b/docs/virtual-network.png
index 2a5b9e08..c895d541 100644
Binary files a/docs/virtual-network.png and b/docs/virtual-network.png differ
diff --git a/weaver/weave b/weaver/weave
index 4b323d7a..837fc178 100755
--- a/weaver/weave
+++ b/weaver/weave
@@ -49,9 +49,17 @@ create_bridge() {
 }
 
 add_nat_rule() {
-    if ! iptables -w -t nat -C $1 >/dev/null 2>&1
+    # -w is recent addition to iptables
+    if [ -z "$CHECKED_IPTABLES_W" ] ; then
+        if iptables -S -w >/dev/null 2>&1 ; then
+            IPTABLES_W=-w
+        fi
+        CHECKED_IPTABLES_W=1
+    fi
+
+    if ! iptables $IPTABLES_W -t nat -C $1 >/dev/null 2>&1
     then
-        iptables -w -t nat -A $1 >/dev/null
+        iptables $IPTABLES_W -t nat -A $1 >/dev/null
     fi
 }