diff --git a/External-switch.startup b/External-switch.startup
index e69de29..b9a8847 100755
--- a/External-switch.startup
+++ b/External-switch.startup
@@ -0,0 +1,3 @@
+# IP of External-switch
+ip addr add 10.0.2.2/24 dev eth0
+ip link set up dev eth0
diff --git a/lab.conf b/lab.conf
index f936d8b..217c526 100755
--- a/lab.conf
+++ b/lab.conf
@@ -9,3 +9,6 @@ Central-router[1]=DMZ
 # DMZ subnet
 DMZ-switch[0]=DMZ
 Squid[0]=DMZ
+
+# External subnet
+External-switch[0]=External