diff --git a/fuelmenu/common/network.py b/fuelmenu/common/network.py
index 31be819..c1237eb 100644
--- a/fuelmenu/common/network.py
+++ b/fuelmenu/common/network.py
@@ -33,8 +33,8 @@ def inSameSubnet(ip1, ip2, netmask_or_cidr):
         cidr1 = netaddr.IPNetwork("%s/%s" % (ip1, netmask_or_cidr))
         cidr2 = netaddr.IPNetwork("%s/%s" % (ip2, netmask_or_cidr))
         return cidr1 == cidr2
-    except netaddr.AddrFormatError:
-        log.exception('Invalid address specified: {0}'.format(cidr1))
+    except netaddr.AddrFormatError as e:
+        log.exception(e.message)
         return False
 
 
diff --git a/fuelmenu/common/puppet.py b/fuelmenu/common/puppet.py
index 3bd05d8..6ede2ee 100644
--- a/fuelmenu/common/puppet.py
+++ b/fuelmenu/common/puppet.py
@@ -68,6 +68,7 @@ def puppetApply(classes):
         log.error("Exit code: %d. Error: %s Stdout: %s",
                   code, err, out)
         return False
+    return True
 
 
 def puppetApplyManifest(manifest):
diff --git a/fuelmenu/consts.py b/fuelmenu/consts.py
index 932e605..8c95c93 100644
--- a/fuelmenu/consts.py
+++ b/fuelmenu/consts.py
@@ -19,9 +19,11 @@ LOGFILE = "/var/log/fuelmenu.log"
 PUPPET_LOGFILE = "/var/log/puppet/fuelmenu-puppet.log"
 PUPPET_NAILGUN = "/etc/puppet/modules/fuel/examples/nailgun.pp"
 PUPPET_FUEL_MASTER = "/etc/puppet/modules/fuel/examples/host.pp"
+PUPPET_DHCP_RANGES = "/etc/puppet/modules/fuel/examples/dhcp-ranges.pp"
 
 SETTINGS_FILE = "/etc/fuel/astute.yaml"
 RELEASE_FILE = "/etc/fuel_release"
+HIERA_NET_SETTINGS = "/etc/hiera/networks.yaml"
 
 DEFAULT_LOCK_FILE = "/var/run/fuelmenu.lock"
 
@@ -31,3 +33,5 @@ POST_DEPLOYMENT_MODE = "post"
 PUPPET_TYPE_LITERAL = "literal"
 PUPPET_TYPE_RESOURCE = "resource"
 PUPPET_TYPE_CLASS = "class"
+
+ADMIN_NETWORK_ID = 1
diff --git a/fuelmenu/modules/cobblerconf.py b/fuelmenu/modules/cobblerconf.py
index 978bb71..37a80f2 100644
--- a/fuelmenu/modules/cobblerconf.py
+++ b/fuelmenu/modules/cobblerconf.py
@@ -13,18 +13,26 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import logging
+import os
+
+from fuelclient.cli import error
+from fuelclient.objects import NetworkGroup
+import netaddr
+import urwid
+import urwid.raw_display
+import urwid.web_display
+import yaml
+
 from fuelmenu.common import dialog
 from fuelmenu.common.errors import BadIPException
 from fuelmenu.common.modulehelper import ModuleHelper
 from fuelmenu.common.modulehelper import WidgetType
 from fuelmenu.common import network
+from fuelmenu.common import puppet
 import fuelmenu.common.urwidwrapper as widget
 from fuelmenu.common import utils
-import logging
-import netaddr
-import urwid
-import urwid.raw_display
-import urwid.web_display
+from fuelmenu import consts
 log = logging.getLogger('fuelmenu.pxe_setup')
 blank = urwid.Divider()
 
@@ -78,6 +86,10 @@ to advertise via DHCP to nodes",
         self.load()
         self.extdhcp = True
         self.screen = None
+        self.apply_dialog_message = {
+            'title': "Apply failed in module {0}".format(self.name),
+            "message": "Error applying changes. Check logs for details."
+        }
 
     def check(self, args):
         """Validates all fields have valid values and some sanity checks."""
@@ -276,10 +288,110 @@ interface first.")
             log.error("Check failed. Not applying")
             log.error("%s" % (responses))
             return False
-
         self.save(responses)
+        if utils.is_post_deployment():
+            self.parent.apply_tasks.add(self.update_dhcp)
         return True
 
+    def update_dhcp(self):
+        settings = self.parent.settings.get("ADMIN_NETWORK")
+        if not self._update_nailgun(settings):
+            return False
+        if os.path.exists(consts.HIERA_NET_SETTINGS):
+            result, msg = self._update_hiera_dnsmasq(settings)
+        else:
+            result = self._update_dnsmasq(settings)
+        if not result:
+            ModuleHelper.display_dialog(
+                self, error_msg=self.apply_dialog_message["message"],
+                title=self.apply_dialog_message["title"])
+            return False
+        cobbler_sync = ["cobbler", "sync"]
+        code, out, err = utils.execute(cobbler_sync)
+        if code != 0:
+            log.error(err)
+            ModuleHelper.display_dialog(
+                self, error_msg=self.apply_dialog_message["message"],
+                title=self.apply_dialog_message["title"])
+            return False
+        return True
+
+    def _update_nailgun(self, settings):
+        msg = "Apply changes to Nailgun"
+        log.info(msg)
+        self.parent.footer.set_text(msg)
+        self.parent.refreshScreen()
+
+        # TODO(mzhnichkov) this manifest apply twice(here and in feature
+        # groups). Need to combine this calls
+        result, msg = puppet.puppetApplyManifest(consts.PUPPET_NAILGUN)
+        if not result:
+            ModuleHelper.display_dialog(
+                self, error_msg=self.apply_dialog_message["message"],
+                title=self.apply_dialog_message["title"])
+            return False
+
+        data = {
+            "gateway": settings["dhcp_gateway"],
+            "ip_ranges": [
+                [settings["dhcp_pool_start"], settings["dhcp_pool_end"]]
+            ]
+        }
+        try:
+            NetworkGroup(consts.ADMIN_NETWORK_ID).set(data)
+        except error.HTTPError as e:
+            log.error(e.message)
+            ModuleHelper.display_dialog(
+                self, error_msg=self.apply_dialog_message["message"],
+                title=self.apply_dialog_message["title"])
+            return False
+        return True
+
+    def _update_hiera_dnsmasq(self, settings):
+        """Update Hiera and dnsmasq
+
+        PXE related configuration should be written in separate
+        configuration file when you create additional admin
+        network(this behavior was introduced in nailgun's
+        DnsmasqUpdateTask class)
+        """
+
+        msg = "Apply changes to Hiera and Dnsmasq"
+        log.info(msg)
+        self.parent.footer.set_text(msg)
+        self.parent.refreshScreen()
+        with open(consts.HIERA_NET_SETTINGS, "r") as hiera_settings:
+            networks = yaml.safe_load(hiera_settings)
+        net = netaddr.IPNetwork(
+            "{0}/{1}".format(settings["ipaddress"],
+                             settings["netmask"]))
+        for admin_net in networks["admin_networks"]:
+            if str(net.cidr) == admin_net["cidr"]:
+                admin_net["ip_ranges"] = [
+                    [settings["dhcp_pool_start"],
+                     settings["dhcp_pool_end"]]
+                ]
+                admin_net["gateway"] = settings["dhcp_gateway"]
+        with open(consts.HIERA_NET_SETTINGS, "w") as hiera_settings:
+            yaml.safe_dump(networks, hiera_settings)
+        return puppet.puppetApplyManifest(consts.PUPPET_DHCP_RANGES)
+
+    def _update_dnsmasq(self, settings):
+        puppet_classes = [{
+            "type": "resource",
+            "class": "fuel::dnsmasq::dhcp_range",
+            "name": "default",
+            "params": {
+                "dhcp_start_address": settings["dhcp_pool_start"],
+                "dhcp_end_address": settings["dhcp_pool_end"],
+                "dhcp_netmask": settings["netmask"],
+                "dhcp_gateway": settings["dhcp_gateway"],
+                "next_server": settings["ipaddress"]
+            }
+        }]
+        log.debug("Start puppet with data {0}".format(puppet_classes))
+        return puppet.puppetApply(puppet_classes)
+
     def cancel(self, button):
         ModuleHelper.cancel(self, button)
         self.setNetworkDetails()
diff --git a/fuelmenu/modules/interfaces.py b/fuelmenu/modules/interfaces.py
index 30e46cf..3709a55 100644
--- a/fuelmenu/modules/interfaces.py
+++ b/fuelmenu/modules/interfaces.py
@@ -306,7 +306,7 @@ class Interfaces(urwid.WidgetWrap):
         try:
             self.parent.refreshScreen()
             result = puppet.puppetApply(puppetclasses)
-            if result is False:
+            if not result:
                 raise Exception("Puppet apply failed")
             ModuleHelper.getNetwork(self)
             gateway = self.get_default_gateway_linux()
diff --git a/fuelmenu/tests/test_common_puppet.py b/fuelmenu/tests/test_common_puppet.py
index 95ee0e4..01c1959 100644
--- a/fuelmenu/tests/test_common_puppet.py
+++ b/fuelmenu/tests/test_common_puppet.py
@@ -58,7 +58,7 @@ class TestPuppetApply(unittest.TestCase):
         ]
 
     def test_puppet_apply(self, m_execute, m_log):
-        self.assertEqual(puppet.puppetApply(self.classes), None)
+        self.assertEqual(puppet.puppetApply(self.classes), True)
         m_execute.assert_called_once_with(self.command, stdin=self.input)
         m_log.info.assert_called_once_with('Puppet start')
         self.assertFalse(m_log.error.called)
diff --git a/setup.py b/setup.py
index c12a55e..e841265 100644
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,7 @@ requirements = [
     'netifaces>=0.5',
     'urwid>=1.1.1',
     'requests>=2.5.2,!=2.8.0,!=2.9.0',
+    'python-fuelclient>=9.0.0'
 ]
 
 if sys.version_info[0:2] == (2, 6):
diff --git a/specs/fuelmenu.spec b/specs/fuelmenu.spec
index 693cea8..80d86c4 100644
--- a/specs/fuelmenu.spec
+++ b/specs/fuelmenu.spec
@@ -26,6 +26,7 @@ Requires: python-urwid >= 1.1.0
 Requires: PyYAML
 Requires: screen
 Requires: python-six
+Requires: python-fuelclient
 %if 0%{?rhel} == 6
 Requires: python-ordereddict
 %endif