diff --git a/neutron/agent/l3/extensions/port_forwarding.py b/neutron/agent/l3/extensions/port_forwarding.py
index 59fa46300d7..6ea1abbe039 100644
--- a/neutron/agent/l3/extensions/port_forwarding.py
+++ b/neutron/agent/l3/extensions/port_forwarding.py
@@ -169,7 +169,7 @@ class PortForwardingAgentExtension(l3_extension.L3AgentExtension):
                 iptables_manager.ipv4['nat'].add_chain(chain)
             iptables_manager.ipv4['nat'].add_rule(chain, rule, tag=rule_tag)
 
-    @coordination.synchronized('port-forwarding-{namespace}')
+    @coordination.synchronized('router-lock-ns-{namespace}')
     def _process_create(self, port_forwardings, ri, interface_name, namespace,
                         iptables_manager):
         if not port_forwardings:
@@ -301,7 +301,7 @@ class PortForwardingAgentExtension(l3_extension.L3AgentExtension):
                 context, [port_forwarding], ri, interface_name, namespace,
                 iptables_manager)
 
-    @coordination.synchronized('port-forwarding-{namespace}')
+    @coordination.synchronized('router-lock-ns-{namespace}')
     def _process_update(self, port_forwardings, iptables_manager,
                         interface_name, namespace):
         if not port_forwardings:
@@ -326,7 +326,7 @@ class PortForwardingAgentExtension(l3_extension.L3AgentExtension):
         iptables_manager.apply()
         self._store_local(port_forwardings, events.UPDATED)
 
-    @coordination.synchronized('port-forwarding-{namespace}')
+    @coordination.synchronized('router-lock-ns-{namespace}')
     def _process_delete(self, context, port_forwardings, ri, interface_name,
                         namespace, iptables_manager):
         if not port_forwardings:
diff --git a/neutron/agent/l3/router_info.py b/neutron/agent/l3/router_info.py
index 7109ea8b13b..ea2b488cd2a 100644
--- a/neutron/agent/l3/router_info.py
+++ b/neutron/agent/l3/router_info.py
@@ -27,6 +27,7 @@ from neutron.agent.l3 import namespaces
 from neutron.agent.linux import ip_lib
 from neutron.agent.linux import iptables_manager
 from neutron.agent.linux import ra
+from neutron.common import coordination
 from neutron.common import ipv6_utils
 from neutron.common import utils as common_utils
 from neutron.ipam import utils as ipam_utils
@@ -983,6 +984,7 @@ class RouterInfo(BaseRouterInfo):
         finally:
             self.update_fip_statuses(fip_statuses)
 
+    @coordination.synchronized('router-lock-ns-{self.ns_name}')
     def process_external(self):
         fip_statuses = {}
         try:
@@ -1191,6 +1193,7 @@ class RouterInfo(BaseRouterInfo):
             self.get_address_scope_mark_mask(address_scope))
         iptables_manager.ipv4['nat'].add_rule('snat', rule)
 
+    @coordination.synchronized('router-lock-ns-{self.ns_name}')
     def process_address_scope(self):
         with self.iptables_manager.defer_apply():
             self.process_ports_address_scope_iptables()