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The IP Route main content pane lists provisioned IP routes. The contents of the list depends on the filter options selected. Click the icons beside a route to edit or delete.
The system acts as the default gateway for its DHCP clients. It can also be specified as the default gateway for devices with static IP addresses on the same subnet as the system. When devices want to send data to IP addresses on different subnets, they will send that data to the system as their default gateway for onward routing.
The IP Route table is used by the system to determine where data traffic should be forwarded. This is done by matching details of the destination IP address to IP Route records and then using the Destination specified by the matching IP route. These are referred to as 'static routes'.
Automatic Routing (RIP): The system can support RIP (Routing Information Protocol) on LAN1 and or LAN2. This is a method through which the system can automatically learn routes for data traffic from other routers that also support matching RIP options, see RIP. These are referred to as 'dynamic routes'. This option is not supported on Linux based servers.
Dynamic versus Static Routes: By default, static routes entered into the system override any dynamic routes it learns by the use of RIP. This behavior is controlled by the Favor RIP Routes over static routes option on the System | System tab.
LAN1 Direct the traffic to the system's LAN1.
LAN2 Traffic can be directed to LAN2.
Service Traffic can be directed to a service. The service defines the details necessary to connect to a remote data service.
Tunnel Traffic can be directed to an IPSec or L2TP tunnel.
Default Service Within the settings for services, one service can be set as the Default Route (Service | Service).
Default IP Route Create an IP Route record with a blank IP Address and blank IP Mask set to the required destination for default traffic.
Routing Information Protocol (RIP) is a protocol which allows routers within a network to exchange routes of which they are aware approximately every 30 seconds. Through this process, each router adds devices and routes in the network to its routing table.
Each router to router link is called a 'hop' and routes of up to 15 hops are created in the routing tables. When more than one route to a destination exists, the route with the lowest metric (number of hops) is added to the routing table.
When an existing route becomes unavailable, after 5 minutes it is marked as requiring 'infinite' (16 hops). It is then advertised as such to other routers for the next few updates before being removed from the routing table. The system also uses 'split horizon' and 'poison reverse'.
RIP is a simple method for automatic route sharing and updating within small homogeneous networks. It allows alternate routes to be advertised when an existing route fails. Within a large network the exchange of routing information every 30 seconds can create excessive traffic. In addition the routing table held by each system is limited to 100 routes (including static and internal routes).
It can be enabled on LAN1, LAN2 and individual services. The normal default is for RIP to be disabled.
Listen Only (Passive): The system listens to RIP1 and RIP2 messages and uses these to update its routing table. However the system does not respond.
RIP1: The system listens to RIP1 and RIP2 messages. It advertises its own routes in a RIP1 sub-network broadcast.
RIP2 Broadcast (RIP1 Compatibility): The system listens to RIP1 and RIP2 messages. It advertises its own routes in a RIP2 sub-network broadcast. This method is compatible with RIP1 routers.
RIP2 Multicast: The system listens to RIP1 and RIP2 messages. It advertises its own routes to the RIP2 multicast address (249.0.0.0). This method is not compatible with RIP1 routers.
Broadcast and multicast routes (those with addresses such as 255.255.255.255 and 224.0.0.0) are not included in RIP broadcasts. Static routes (those in the IP Route table) take precedence over a RIP route when the two routes have the same metric.