-diff --git a/neunton/agent/l3_agent.py b/neunton/agent/l3_agent.py
-index 79156cd..0037b80 100644
---- a/neunton/agent/l3_agent.py
-+++ b/neunton/agent/l3_agent.py
-@@ -23,6 +23,7 @@ import eventlet
- from eventlet import semaphore
- import netaddr
- from oslo.config import cfg
-+from quantum.agent.linux.interface import OVSInterfaceDriver
-
- from neunton.agent.common import config
- from neunton.agent.linux import external_process
-@@ -233,7 +234,8 @@ class L3NATAgent(manager.Manager):
- for c, r in self.metadata_nat_rules():
- ri.iptables_manager.ipv4['nat'].add_rule(c, r)
- ri.iptables_manager.apply()
-- self._spawn_metadata_proxy(ri)
-+ if self.conf.use_namespaces:
-+ self._spawn_metadata_proxy(ri)
-
- def _router_removed(self, router_id):
- ri = self.router_info[router_id]
-@@ -246,7 +248,8 @@ class L3NATAgent(manager.Manager):
- for c, r in self.metadata_nat_rules():
- ri.iptables_manager.ipv4['nat'].remove_rule(c, r)
- ri.iptables_manager.apply()
-- self._destroy_metadata_proxy(ri)
-+ if self.conf.use_namespaces:
-+ self._destroy_metadata_proxy(ri)
- del self.router_info[router_id]
- self._destroy_router_namespace(ri.ns_name())
-
-@@ -370,7 +373,9 @@ class L3NATAgent(manager.Manager):
- ri.floating_ips.append(new_fip)
-
- def _get_ex_gw_port(self, ri):
-- return ri.router.get('gw_port')
-+ rv = ri.router.get('gw_port')
-+ LOG.debug("***SV::_get_ex_gw_port: {0}".format(rv))
-+ return rv
-
- def _send_gratuitous_arp_packet(self, ri, interface_name, ip_address):
- if self.conf.send_arp_for_ha > 0:
-@@ -390,49 +395,78 @@ class L3NATAgent(manager.Manager):
- LOG.error(_("Failed sending gratuitous ARP: %s"), str(e))
-
- def get_internal_device_name(self, port_id):
-- return (INTERNAL_DEV_PREFIX + port_id)[:self.driver.DEV_NAME_LEN]
-+ devname = INTERNAL_DEV_PREFIX + port_id
-+ LOG.debug("***SV::get_internal_device_name: {0}".format(devname))
-+ return devname[:self.driver.DEV_NAME_LEN]
-
- def get_external_device_name(self, port_id):
-- return (EXTERNAL_DEV_PREFIX + port_id)[:self.driver.DEV_NAME_LEN]
-+ devname = EXTERNAL_DEV_PREFIX + port_id
-+ LOG.debug("***SV::get_external_device_name: {0}".format(devname))
-+ return devname[:self.driver.DEV_NAME_LEN]
-
-- def external_gateway_added(self, ri, ex_gw_port, internal_cidrs):
-+ def get_effective_interface_name(self, ifname):
-+ if not self.conf.use_namespaces:
-+ return self.conf.external_network_bridge
-+ else:
-+ return ifname
-
-+ def external_gateway_added(self, ri, ex_gw_port, internal_cidrs):
-+ ### SV: patched !!!
- interface_name = self.get_external_device_name(ex_gw_port['id'])
-+ effective_interface_name = self.get_effective_interface_name(interface_name)
- ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address']
-- if not ip_lib.device_exists(interface_name,
-- root_helper=self.root_helper,
-- namespace=ri.ns_name()):
-+ ip_address = ex_gw_port['ip_cidr'].split('/')[0]
-+ if not ip_lib.device_exists(interface_name, root_helper=self.root_helper, namespace=ri.ns_name()):
- self.driver.plug(ex_gw_port['network_id'],
- ex_gw_port['id'], interface_name,
- ex_gw_port['mac_address'],
- bridge=self.conf.external_network_bridge,
- namespace=ri.ns_name(),
-- prefix=EXTERNAL_DEV_PREFIX)
-- self.driver.init_l3(interface_name, [ex_gw_port['ip_cidr']],
-- namespace=ri.ns_name())
-- ip_address = ex_gw_port['ip_cidr'].split('/')[0]
-- self._send_gratuitous_arp_packet(ri, interface_name, ip_address)
-+ prefix=EXTERNAL_DEV_PREFIX
-+ )
-+
-+ if not self.conf.use_namespaces:
-+ LOG.info("Warning! You are not using network namespaces! "
-+ "IP {ip} will be assigned to interface {iface}, instead {eiface}."
-+ .format(
-+ ip=ex_gw_port['ip_cidr'],
-+ iface=interface_name,
-+ eiface=effective_interface_name
-+ )
-+ )
-+ net = netaddr.IPNetwork(ex_gw_port['ip_cidr'])
-+ device = ip_lib.IPDevice(effective_interface_name, self.root_helper, namespace=ri.ns_name())
-+ device.addr.add(net.version, ex_gw_port['ip_cidr'], str(net.broadcast))
-+ else:
-+ self.driver.init_l3(interface_name, [ex_gw_port['ip_cidr']], namespace=ri.ns_name())
-+
-+ self._send_gratuitous_arp_packet(ri, effective_interface_name, ip_address)
-
- gw_ip = ex_gw_port['subnet']['gateway_ip']
-- if ex_gw_port['subnet']['gateway_ip']:
-- cmd = ['route', 'add', 'default', 'gw', gw_ip]
-- if self.conf.use_namespaces:
-- ip_wrapper = ip_lib.IPWrapper(self.root_helper,
-- namespace=ri.ns_name())
-- ip_wrapper.netns.execute(cmd, check_exit_code=False)
-- else:
-- utils.execute(cmd, check_exit_code=False,
-- root_helper=self.root_helper)
-+ if interface_name == effective_interface_name:
-+ # work in net.namespaces, or 1st assignation on this interface
-+ if ex_gw_port['subnet']['gateway_ip']:
-+ cmd = ['route', 'add', 'default', 'gw', gw_ip]
-+ if self.conf.use_namespaces:
-+ ip_wrapper = ip_lib.IPWrapper(self.root_helper, namespace=ri.ns_name())
-+ ip_wrapper.netns.execute(cmd, check_exit_code=False)
-+ else:
-+ utils.execute(cmd, check_exit_code=False, root_helper=self.root_helper)
-
-- for (c, r) in self.external_gateway_nat_rules(ex_gw_ip,
-- internal_cidrs,
-- interface_name):
-+ for (c, r) in self.external_gateway_nat_rules(ex_gw_ip, internal_cidrs, effective_interface_name):
- ri.iptables_manager.ipv4['nat'].add_rule(c, r)
- ri.iptables_manager.apply()
-
- def external_gateway_removed(self, ri, ex_gw_port, internal_cidrs):
--
- interface_name = self.get_external_device_name(ex_gw_port['id'])
-+ effective_interface_name = self.get_effective_interface_name(interface_name)
-+ ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address']
-+
-+ if not self.conf.use_namespaces:
-+ net = netaddr.IPNetwork(ex_gw_ip)
-+ device = ip_lib.IPDevice(effective_interface_name, self.root_helper, namespace=ri.ns_name())
-+ device.addr.delete(net.version, ex_gw_ip)
-+
- if ip_lib.device_exists(interface_name,
- root_helper=self.root_helper,
- namespace=ri.ns_name()):
-@@ -441,9 +475,7 @@ class L3NATAgent(manager.Manager):
- namespace=ri.ns_name(),
- prefix=EXTERNAL_DEV_PREFIX)
-
-- ex_gw_ip = ex_gw_port['fixed_ips'][0]['ip_address']
-- for c, r in self.external_gateway_nat_rules(ex_gw_ip, internal_cidrs,
-- interface_name):
-+ for c, r in self.external_gateway_nat_rules(ex_gw_ip, internal_cidrs, effective_interface_name):
- ri.iptables_manager.ipv4['nat'].remove_rule(c, r)
- ri.iptables_manager.apply()
-
-@@ -463,6 +495,7 @@ class L3NATAgent(manager.Manager):
-
- def external_gateway_nat_rules(self, ex_gw_ip, internal_cidrs,
- interface_name):
-+ ### SV: need-patch !!!
- rules = [('POSTROUTING', '! -i %(interface_name)s '
- '! -o %(interface_name)s -m conntrack ! '
- '--ctstate DNAT -j ACCEPT' % locals())]
-@@ -475,7 +508,7 @@ class L3NATAgent(manager.Manager):
- interface_name = self.get_internal_device_name(port_id)
- if not ip_lib.device_exists(interface_name,
- root_helper=self.root_helper,
-- namespace=ri.ns_name()):
-+ namespace=ri.ns_name()): # check existing MAC address of qr_*
- self.driver.plug(network_id, port_id, interface_name, mac_address,
- namespace=ri.ns_name(),
- prefix=INTERNAL_DEV_PREFIX)
-@@ -513,27 +546,38 @@ class L3NATAgent(manager.Manager):
- return rules
-
- def floating_ip_added(self, ri, ex_gw_port, floating_ip, fixed_ip):
-+ ### SV: patched !!!
- ip_cidr = str(floating_ip) + '/32'
- interface_name = self.get_external_device_name(ex_gw_port['id'])
-- device = ip_lib.IPDevice(interface_name, self.root_helper,
-- namespace=ri.ns_name())
-+ effective_interface_name = self.get_effective_interface_name(interface_name)
-+ if not self.conf.use_namespaces:
-+ LOG.info("Warning! You are not using network namespaces! "
-+ "Floating IP {ip} will be assigned to interface {iface}, instead {eiface}."
-+ .format(
-+ ip=ip_cidr,
-+ iface=interface_name,
-+ eiface=effective_interface_name
-+ )
-+ )
-+ device = ip_lib.IPDevice(effective_interface_name, self.root_helper, namespace=ri.ns_name())
-
- if ip_cidr not in [addr['cidr'] for addr in device.addr.list()]:
- net = netaddr.IPNetwork(ip_cidr)
- device.addr.add(net.version, ip_cidr, str(net.broadcast))
-- self._send_gratuitous_arp_packet(ri, interface_name, floating_ip)
-+ self._send_gratuitous_arp_packet(ri, effective_interface_name, floating_ip)
-
- for chain, rule in self.floating_forward_rules(floating_ip, fixed_ip):
- ri.iptables_manager.ipv4['nat'].add_rule(chain, rule)
- ri.iptables_manager.apply()
-
- def floating_ip_removed(self, ri, ex_gw_port, floating_ip, fixed_ip):
-+ ### SV: patched !!!
- ip_cidr = str(floating_ip) + '/32'
- net = netaddr.IPNetwork(ip_cidr)
- interface_name = self.get_external_device_name(ex_gw_port['id'])
-+ effective_interface_name = self.get_effective_interface_name(interface_name)
-
-- device = ip_lib.IPDevice(interface_name, self.root_helper,
-- namespace=ri.ns_name())
-+ device = ip_lib.IPDevice(effective_interface_name, self.root_helper, namespace=ri.ns_name())
- device.addr.delete(net.version, ip_cidr)
-
- for chain, rule in self.floating_forward_rules(floating_ip, fixed_ip):
-@@ -642,7 +686,16 @@ class L3NATAgent(manager.Manager):
- self.fullsync = True
-
- def after_start(self):
-- LOG.info(_("L3 agent started"))
-+ LOG.info(_("L3 agent started (Mirantis-patched)"))
-+ LOG.debug("*Ext.bridge name is '{0}'".format(self.conf.external_network_bridge))
-+ if not self.conf.use_namespaces:
-+ LOG.info("Warning!!!")
-+ LOG.info("You are not using network namespaces! "
-+ "Floating IPs will be assigned to interface {iface}".format(
-+ iface=self.conf.external_network_bridge
-+ )
-+ )
-+
-
- def _update_routing_table(self, ri, operation, route):
- cmd = ['ip', 'route', operation, 'to', route['destination'],