5-34 D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUALPRODUCT SETUP CHAPTER 5: SETTINGS55.3.4.7 RoutingSETTINGS PRODUCT SETUP COMMUNICATIONS IPv4 ROUTE TABLE 1(6)A default route and up to six static routes can be configured.The default route is used as the last choice when no other route towards a given destination is found.Configure the network IP and subnet settings before configuring the routing settings.Add and delete static routesHost routes are not supported at present.The routing table configuration is available on the serial port and front panel. This is a deliberate decision, to avoid loss ofconnectivity when remotely configuring the D30.By default, the value of the destination field is 127.0.0.1 for all static routes (1 to 6). This is equivalent to saying that thestatic routes are not configured. When the destination address is 127.0.0.1, the mask and gateway also must be kept ondefault values.By default, the value of the route gateway address is 127.0.0.1. This means that the default route is not configured.To add a route:1. Use any of the static network route entries numbered 1 to 6 to configure a static network route. Once a routedestination is configured for any of the entries 1 to 6, that entry becomes a static route and it must meet all the ruleslisted in the next section, General Conditions to be Satisfied by Static Routes.2. To configure the default route, enter a default gateway address. Once a default gateway address is configured, itmust be validated against condition 2 of the General Conditions to be Satisfied by Static Routes, where the routegateway must be on a connected network.To delete a route:1. Replace the route destination with the default loopback address of 127.0.0.1. When deleting a route, the mask andgateway also must be brought back to default values.2. Delete the default route by replacing the default gateway with the default value of 127.0.0.1.General conditions to be satisfied by static routesThe following rules are validated internally: IPv4 ROUTE TABLE DEFAULT IPv4 ROUTE IPv4 NETWORKROUTE 1 IPv4 NETWORKROUTE 6 DEFAULT IPv4 ROUTE GATEWAY ADDRESS:127.0.0.1Range: standard IPV4 unicast address format IPv4 NETWORK ROUTE 1 RT1 DESTINATION:127.0.0.1Range: standard IPV4 address format RT1 NET MASK:255.0.0.0Range: standard IPV4 subnet mask format RT1 GATEWAY:127.0.0.1Range: standard IPV4 unicast address format
