diff --git a/packstack/installer/processors.py b/packstack/installer/processors.py
index 1355452a4..9f7e0d190 100644
--- a/packstack/installer/processors.py
+++ b/packstack/installer/processors.py
@@ -1,12 +1,24 @@
 # -*- coding: utf-8 -*-
 
+import netaddr
 import os
 
 from .utils import ScriptRunner, force_ip
 from .exceptions import ParamProcessingError, NetworkError
 
 
-__all__ = ('ParamProcessingError', 'process_host', 'process_ssh_key')
+__all__ = ('ParamProcessingError', 'process_cidr', 'process_host',
+           'process_ssh_key')
+
+
+def process_cidr(param, process_args=None):
+    """
+    Corrects given CIDR if necessary.
+    """
+    try:
+        return str(netaddr.IPNetwork(param).cidr)
+    except Exception, ex:
+        raise ParamProcessingError(str(ex))
 
 
 def process_host(param, process_args=None):
diff --git a/packstack/plugins/nova_300.py b/packstack/plugins/nova_300.py
index 1580f7683..a3bcc3358 100644
--- a/packstack/plugins/nova_300.py
+++ b/packstack/plugins/nova_300.py
@@ -6,8 +6,7 @@ import os
 import uuid
 import logging
 
-from packstack.installer import validators
-from packstack.installer import utils
+from packstack.installer import processors, utils, validators
 from packstack.installer.exceptions import ScriptRuntimeError
 
 from packstack.modules.ospluginutils import NovaConfig, getManifestTemplate, appendManifestFile, manifestfiles
@@ -203,6 +202,7 @@ def initConfig(controllerObject):
                    "USAGE"           : "IP Range for Flat DHCP",
                    "PROMPT"          : "Enter the IP Range for Flat DHCP",
                    "OPTION_LIST"     : ["^([\d]{1,3}\.){3}[\d]{1,3}/\d\d?$"],
+                   "PROCESSORS"      : [processors.process_cidr],
                    "VALIDATORS"      : [validators.validate_regexp],
                    "DEFAULT_VALUE"   : "192.168.32.0/22",
                    "MASK_INPUT"      : False,
@@ -215,6 +215,7 @@ def initConfig(controllerObject):
                    "USAGE"           : "IP Range for Floating IP's",
                    "PROMPT"          : "Enter the IP Range for Floating IP's",
                    "OPTION_LIST"     : ["^([\d]{1,3}\.){3}[\d]{1,3}/\d\d?$"],
+                   "PROCESSORS"      : [processors.process_cidr],
                    "VALIDATORS"      : [validators.validate_regexp],
                    "DEFAULT_VALUE"   : "10.3.4.0/22",
                    "MASK_INPUT"      : False,
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 000000000..3721f7851
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+netaddr>=0.7.6
diff --git a/setup.py b/setup.py
index 66f8b39ca..44d290cff 100644
--- a/setup.py
+++ b/setup.py
@@ -24,6 +24,7 @@ setup(
     include_package_data=True,
     long_description=read('README'),
     zip_safe=False,
+    install_requires=['netaddr'],
     classifiers=[
         "Development Status :: 3 - Alpha",
         "Topic :: Utilities",