Update README.md

Author: Springjunky

README.md

@@ -55,15 +55,20 @@ fi
 PORTS_TO_BLOCK="80,5555,2222"
 EXTERNAL_INTERFACE=$1
 
+# Flush an delete custom Chains
 iptables -F DOCKER-USER
 iptables -F EXTERNAL-ACCESS-DENY
 iptables -X EXTERNAL-ACCESS-DENY
 
+# Create a  log-and-drop Chain
 iptables -N EXTERNAL-ACCESS-DENY
 iptables -A EXTERNAL-ACCESS-DENY -j LOG --log-prefix "DCKR-EXT-ACCESS-DENY:" --log-level 6
 iptables -A EXTERNAL-ACCESS-DENY -j DROP
 
+# Block all incomming traffic for docker 
 iptables -A DOCKER-USER -i $EXTERNAL_INTERFACE -p tcp --match multiport --dports $PORTS_TO_BLOCK -j EXTERNAL-ACCESS-DENY 
+
+# Restore default rule to return all the back to FORWARD-Chain
 iptables -A DOCKER-USER -j RETURN
 
 echo "Rules created "