diff --git a/IM/VirtualMachine.py b/IM/VirtualMachine.py
index a7c8aa1ba..13b92a823 100644
--- a/IM/VirtualMachine.py
+++ b/IM/VirtualMachine.py
@@ -461,7 +461,7 @@ def setIps(self,public_ips,private_ips):
 				private_net_mask = None
 
 				# Get the private network mask
-				for mask in network.private_net_masks:
+				for mask in Config.PRIVATE_NET_MASKS:
 					if IPAddress(private_ip) in IPNetwork(mask):
 						private_net_mask = mask
 						break
diff --git a/IM/config.py b/IM/config.py
index e0b2f3b04..1a7145a10 100644
--- a/IM/config.py
+++ b/IM/config.py
@@ -27,6 +27,9 @@ def parse_options(config, section_name, config_class):
 				config_class.__dict__[option] = config.getboolean(section_name, option)
 			elif isinstance(config_class.__dict__[option], int):
 				config_class.__dict__[option] = config.getint(section_name, option)
+			elif isinstance(config_class.__dict__[option], list):
+				str_value = config.get(section_name, option)
+				config_class.__dict__[option] = str_value.split(',')
 			else:
 				config_class.__dict__[option] = config.get(section_name, option)
 		else:
@@ -76,7 +79,7 @@ class Config:
 	VM_INFO_UPDATE_ERROR_GRACE_PERIOD = 120 # This value must be always higher than VM_INFO_UPDATE_FREQUENCY 
 	REMOTE_CONF_DIR = "/tmp/.im"
 	MAX_SSH_ERRORS = 5
-	PRIVATE_NET_AS_PUBLIC = ''
+	PRIVATE_NET_MASKS = ["10.0.0.0/8","172.16.0.0/12","192.168.0.0/16","169.254.0.0/16","100.64.0.0/10","192.0.0.0/24","198.18.0.0/15"]
 	CHECK_CTXT_PROCESS_INTERVAL = 5
 	CONFMAMAGER_CHECK_STATE_INTERVAL = 5
 	UPDATE_CTXT_LOG_INTERVAL = 20
diff --git a/IM/radl/radl.py b/IM/radl/radl.py
index 03323bb5b..1ff2082d1 100644
--- a/IM/radl/radl.py
+++ b/IM/radl/radl.py
@@ -660,10 +660,6 @@ def check(self, radl):
 
 class network(Features, Aspect):
 	"""Store a RADL ``network``."""
-	
-	private_net_masks = ["10.0.0.0/8","172.16.0.0/12","192.168.0.0/16","169.254.0.0/16","100.64.0.0/10","192.0.0.0/24","198.18.0.0/15"]
-	if Config.PRIVATE_NET_AS_PUBLIC in private_net_masks:
-		private_net_masks.remove(Config.PRIVATE_NET_AS_PUBLIC)
 
 	def __init__(self, name, features=None, reference=False, line=None):
 		self.id = name
@@ -678,8 +674,7 @@ def isPrivateIP(ip):
 		"""
 		Check if an IP address is private
 		"""
-		
-		for mask in network.private_net_masks: 
+		for mask in Config.PRIVATE_NET_MASKS: 
 			if IPAddress(ip) in IPNetwork(mask):
 				return True
 		return False
diff --git a/changelog b/changelog
index 47dde98c5..fa93bceae 100644
--- a/changelog
+++ b/changelog
@@ -140,4 +140,4 @@ IM 1.3.2
     * Bugfix in ConfManager formatting volumes
     * Change Ansible version to 1.9.2
     * Improve documentation
-
+    * Remove PRIVATE_NET_AS_PUBLIC configuration variable and add PRIVATE_NET_MASKS
diff --git a/doc/source/manual.rst b/doc/source/manual.rst
index 8d43d1785..9330da12e 100644
--- a/doc/source/manual.rst
+++ b/doc/source/manual.rst
@@ -413,19 +413,18 @@ GANGLIA INTEGRATION
    Maximum frequency to update the Ganglia info (in secs).
    The default value is ``30``.
 
-IM IN LOCAL INSTALLATIONS
-^^^^^^^^^^^^^^^^^^^^^^^^^
+NETWORK OPTIONS
+^^^^^^^^^^^^^^^
 
-.. confval:: PRIVATE_NET_AS_PUBLIC 
+.. confval:: PRIVATE_NET_MASKS 
 
-   Private network that IM will detect as public enabling to use
-   the IM service in installations of only one private Cloud provider.
-   It must be one of this values: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.0.0/16
-   If this feature is not needed undefine or use an empty string.
-   The default value is ``''``.
+   List of networks assumed as private. The IM use it to distinguish private from public networks.
+   IM considers IPs not in these subnets as Public IPs.
+   It must be a coma separated string of the network definitions (using CIDR) (without spaces).
+   The default value is ``'10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,192.0.0.0/24,169.254.0.0/16,100.64.0.0/10,198.18.0.0/15'``.
    
-OpenNebula Options
-^^^^^^^^^^^^^^^^^^
+OpenNebula connector Options
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 The configuration values under the ``OpenNebula`` section:
 
diff --git a/etc/im.cfg b/etc/im.cfg
index 65eaf969b..f7fe593c0 100644
--- a/etc/im.cfg
+++ b/etc/im.cfg
@@ -97,6 +97,11 @@ GANGLIA_INFO_UPDATE_FREQUENCY = 30
 # Number of retries of the Ansible playbooks in case of failure
 PLAYBOOK_RETRIES = 3
 
+# List of networks assumed as private
+# It must be a coma separated string of the network definitions (without spaces)
+# This are the default values: 
+# PRIVATE_NET_MASKS = "10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,169.254.0.0/16,100.64.0.0/10,192.0.0.0/24,198.18.0.0/15"
+
 [OpenNebula]
 # OpenNebula connector configuration values