diff --git a/src/maasserver/preseed_network.py b/src/maasserver/preseed_network.py
index 1be72d6..96ee6a3 100644
--- a/src/maasserver/preseed_network.py
+++ b/src/maasserver/preseed_network.py
@@ -192,7 +192,7 @@ class InterfaceConfiguration:
         return {
             route
             for route in self.routes
-            if route.source == source
+            if str(route.source.cidr) == str(source.cidr)
         }
 
     def _generate_addresses(self, version=1):
@@ -251,8 +251,12 @@ class InterfaceConfiguration:
                                 v2_nameservers["addresses"] = []
                         v2_nameservers["addresses"].extend(
                             [server for server in subnet.dns_servers])
-                    self.matching_routes.update(
-                        self._get_matching_routes(subnet))
+                    net_routes = self._get_matching_routes(subnet)
+                    rl = [_generate_route_operation(r, version=version)
+                          for r
+                          in net_routes]
+                    v1_subnet_operation['routes'] = rl
+                    v2_config['routes'] =  rl
             if dhcp_type:
                 v1_config.append(
                     {"type": dhcp_type}