diff --git a/uml/network.pu b/uml/network.pu
new file mode 100644
index 0000000..cad7b67
--- /dev/null
+++ b/uml/network.pu
@@ -0,0 +1,21 @@
+@startuml
+nwdiag {
+  inet [shape = cloud];
+  inet -- router;
+
+  network Proxy {
+    router [shape = node];
+    raspi2 [address = "surveyor.mydns.jp", shape=node];
+  }
+
+  network DMZ {
+    raspi2 [address = "192.168.0.200", shape=node];
+    raspi3 [address = ".201", shape=node];
+    macmini [address = ".202", shape=node];
+    t3400 [address = ".203", shape=node];
+    ark-a [shape=node];
+    ark-b [shape=node];
+    ark-c [shape=node];
+  }
+}
+@enduml