diff --git a/sec/ex-4_iptables.adoc b/sec/ex-4_iptables.adoc
index e1fbc42..ad27428 100644
--- a/sec/ex-4_iptables.adoc
+++ b/sec/ex-4_iptables.adoc
@@ -39,6 +39,38 @@ Assuming you're already logged in
 https://en.wikipedia.org/wiki/Shorewall[More: wikipedia]
 
 
+.NOTE
+[NOTE]
+====
+Our docker instances have only one nic
+
+to add more nic's:
+
+.create netowrk frist
+[source,bash]
+----
+docker network create --driver=bridge --subnet=192.168.0.0/16 net1
+docker network create --driver=bridge --subnet=192.168.0.0/16 net2
+docker network create --driver=bridge --subnet=192.168.0.0/16 net3
+----
+
+then connect network to container
+
+.create netowrk frist
+[source,bash]
+----
+docker network connect net1 master
+docker network connect net1 worker1
+docker network connect net2 master
+docker network connect net2 worker2
+----
+
+now let's look at the following image
+
+
+====
+
+
 === Installation
 
 Shorewall is already installed on swarmlab-sec. 
@@ -203,6 +235,18 @@ ACCEPT     $FW       net                udp       53
 ACCEPT     net       $FW         	udp       53
 ACCEPT     $FW       net                tcp       80
 ACCEPT     net       $FW         	tcp       80
+#New lines
+ACCEPT     $FW       dmz                udp       53
+ACCEPT     dmz       $FW         	udp       53
+ACCEPT     $FW       dmz                tcp       80
+ACCEPT     dmz       $FW         	tcp       80
+
+ACCEPT     loc       dmz                tcp       80 # Add your rules for the zones  you have defined.
+ACCEPT     dmz       loc         	tcp       80 #
+ACCEPT     loc       net                tcp       80 # This here is an example
+ACCEPT     net       loc         	tcp       80 # for communication 
+ACCEPT     dmz       net                tcp       80 # over port 80
+ACCEPT     net       dmz         	tcp       80 # aka the web
 ----