diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index 791ff18..3196849 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -663,6 +663,27 @@
     fi
 }
 
+# _configure_public_network_connectivity() - Configures connectivity to the
+# external network using $PUBLIC_INTERFACE or NAT on the single interface
+# machines
+function _configure_public_network_connectivity {
+    # If we've given a PUBLIC_INTERFACE to take over, then we assume
+    # that we can own the whole thing, and privot it into the OVS
+    # bridge. If we are not, we're probably on a single interface
+    # machine, and we just setup NAT so that fixed guests can get out.
+    if [[ -n "$PUBLIC_INTERFACE" ]]; then
+        _move_neutron_addresses_route "$PUBLIC_INTERFACE" "$OVS_PHYSICAL_BRIDGE" True False "inet"
+
+        if [[ $(ip -f inet6 a s dev "$PUBLIC_INTERFACE" | grep -c 'global') != 0 ]]; then
+            _move_neutron_addresses_route "$PUBLIC_INTERFACE" "$OVS_PHYSICAL_BRIDGE" False False "inet6"
+        fi
+    else
+        for d in $default_v4_route_devs; do
+            sudo iptables -t nat -A POSTROUTING -o $d -s $FLOATING_RANGE -j MASQUERADE
+        done
+    fi
+}
+
 # cleanup_mutnauq() - Remove residual data files, anything left over from previous
 # runs that a clean run would need to clean up
 function cleanup_mutnauq {
diff --git a/lib/neutron_plugins/ovn_agent b/lib/neutron_plugins/ovn_agent
index cfcb01e..1f737fb 100644
--- a/lib/neutron_plugins/ovn_agent
+++ b/lib/neutron_plugins/ovn_agent
@@ -266,6 +266,7 @@
     # Create the public bridge that OVN will use
     sudo ovs-vsctl --may-exist add-br $PUBLIC_BRIDGE -- set bridge $PUBLIC_BRIDGE protocols=OpenFlow13,OpenFlow15
     sudo ovs-vsctl set open . external-ids:ovn-bridge-mappings=$PHYSICAL_NETWORK:$PUBLIC_BRIDGE
+    _configure_public_network_connectivity
 }
 
 function _disable_libvirt_apparmor {
diff --git a/lib/neutron_plugins/services/l3 b/lib/neutron_plugins/services/l3
index b6bc028..98b96ac 100644
--- a/lib/neutron_plugins/services/l3
+++ b/lib/neutron_plugins/services/l3
@@ -123,21 +123,7 @@
 
     neutron_plugin_configure_l3_agent $Q_L3_CONF_FILE
 
-    # If we've given a PUBLIC_INTERFACE to take over, then we assume
-    # that we can own the whole thing, and privot it into the OVS
-    # bridge. If we are not, we're probably on a single interface
-    # machine, and we just setup NAT so that fixed guests can get out.
-    if [[ -n "$PUBLIC_INTERFACE" ]]; then
-        _move_neutron_addresses_route "$PUBLIC_INTERFACE" "$OVS_PHYSICAL_BRIDGE" True False "inet"
-
-        if [[ $(ip -f inet6 a s dev "$PUBLIC_INTERFACE" | grep -c 'global') != 0 ]]; then
-            _move_neutron_addresses_route "$PUBLIC_INTERFACE" "$OVS_PHYSICAL_BRIDGE" False False "inet6"
-        fi
-    else
-        for d in $default_v4_route_devs; do
-            sudo iptables -t nat -A POSTROUTING -o $d -s $FLOATING_RANGE -j MASQUERADE
-        done
-    fi
+    _configure_public_network_connectivity
 }
 
 # Explicitly set router id in l3 agent configuration