diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index f4e577d..f83492b 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -203,7 +203,7 @@
 # agent, as described below.
 #
 # Example: ``PHYSICAL_NETWORK=default``
-PHYSICAL_NETWORK=${PHYSICAL_NETWORK:-}
+PHYSICAL_NETWORK=${PHYSICAL_NETWORK:-public}
 
 # With the openvswitch agent, if using VLANs for tenant networks,
 # or if using flat or VLAN provider networks, set in ``localrc`` to
@@ -213,7 +213,7 @@
 # port for external connectivity.
 #
 # Example: ``OVS_PHYSICAL_BRIDGE=br-eth1``
-OVS_PHYSICAL_BRIDGE=${OVS_PHYSICAL_BRIDGE:-}
+OVS_PHYSICAL_BRIDGE=${OVS_PHYSICAL_BRIDGE:-br-ex}
 
 # With the linuxbridge agent, if using VLANs for tenant networks,
 # or if using flat or VLAN provider networks, set in ``localrc`` to
diff --git a/lib/neutron_plugins/services/l3 b/lib/neutron_plugins/services/l3
index 2180099..816679e 100644
--- a/lib/neutron_plugins/services/l3
+++ b/lib/neutron_plugins/services/l3
@@ -17,6 +17,11 @@
 PUBLIC_BRIDGE=${PUBLIC_BRIDGE:-br-ex}
 PUBLIC_BRIDGE_MTU=${PUBLIC_BRIDGE_MTU:-1500}
 
+# If Q_ASSIGN_GATEWAY_TO_PUBLIC_BRIDGE=True, assign the gateway IP of the public
+# subnet to the public bridge interface even if Q_USE_PROVIDERNET_FOR_PUBLIC is
+# used.
+Q_ASSIGN_GATEWAY_TO_PUBLIC_BRIDGE=${Q_ASSIGN_GATEWAY_TO_PUBLIC_BRIDGE:-True}
+
 # If Q_USE_PUBLIC_VETH=True, create and use a veth pair instead of
 # PUBLIC_BRIDGE.  This is intended to be used with
 # Q_USE_PROVIDERNET_FOR_PUBLIC=True.
@@ -51,7 +56,7 @@
 #    Q_USE_PROVIDERNET_FOR_PUBLIC=True
 #    PUBLIC_PHYSICAL_NETWORK=public
 #    OVS_BRIDGE_MAPPINGS=public:br-ex
-Q_USE_PROVIDERNET_FOR_PUBLIC=${Q_USE_PROVIDERNET_FOR_PUBLIC:-False}
+Q_USE_PROVIDERNET_FOR_PUBLIC=${Q_USE_PROVIDERNET_FOR_PUBLIC:-True}
 PUBLIC_PHYSICAL_NETWORK=${PUBLIC_PHYSICAL_NETWORK:-public}
 
 # Generate 40-bit IPv6 Global ID to comply with RFC 4193
@@ -305,7 +310,7 @@
             local cidr_len=${FLOATING_RANGE#*/}
             local testcmd="ip -o link | grep -q $ext_gw_interface"
             test_with_retry "$testcmd" "$ext_gw_interface creation failed"
-            if [[ $(ip addr show dev $ext_gw_interface | grep -c $ext_gw_ip) == 0 && ( $Q_USE_PROVIDERNET_FOR_PUBLIC == "False" || $Q_USE_PUBLIC_VETH == "True" ) ]]; then
+            if [[ $(ip addr show dev $ext_gw_interface | grep -c $ext_gw_ip) == 0 && ( $Q_USE_PROVIDERNET_FOR_PUBLIC == "False" || $Q_USE_PUBLIC_VETH == "True" || $Q_ASSIGN_GATEWAY_TO_PUBLIC_BRIDGE == "True" ) ]]; then
                 sudo ip addr add $ext_gw_ip/$cidr_len dev $ext_gw_interface
                 sudo ip link set $ext_gw_interface up
             fi