The router connects several subnets and assumes forwarding of data packets from the devices in the respective subnets into other subnets. This means that incoming data packets are routed to certain network devices according to certain rules defined by the user.
The routes determine whereto packets are forwarded. They are stored in the routing table of the router. The routes will only be entered into the routing table if the interface selected when creating the route is started.
Adding a route
Routes are added in the Routing menu on the Static routes page. When adding the route, it will be differentiated between a default route and a network route.
In case of a network route, the route is only effective for data packets that are directed to the network specified here (e.g. 192.168.101.0/24) or the network address specified here (e.g. 192.168.101.11).
A default route forwards the data packets to the configured gateway, for which no dedicated route has been found in the routing table.
The gateway can be defined by a dynamically received IP address, by a static IP address or by specifying an interface.
Dynamically received IP address
For the dynamically received IP address, the DHCP client of the interface must be activated that an address can be assigned. The DHCP client can be activated in the Interfaces menu on the IP net page of the respective network.
Static IP address
A static IP address can also be assigned to the gateway.
An interface (a VPN tunnel for example) can also act as a gateway.
Priority of the route
A priority must be specified if several data routes are created in case the associated interfaces are started simultaneously. The route with the lowest priority number will always be effective then. If there is no priority specified, the route which has been entered first will be effective.
The routes entered in the routing table can be displayed in the Status menu on the System details / Routes page. It must be observed here that the routes will only be entered with the start of their interface.
Processing the routing table
The router will investigate each incoming data packet and proceed as follows: