Ip Routing; Overview Of Control Network - Net Insight Nimbra One User Manual

IP routing

52 • Control Network
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Setting up DLE only configures the individual DLE segments. As with all IP
networks, routing must be configured in each node to be able to route the
traffic in and out of the DLE segment. Setting up IP routing for a DLE segment
is not different from setting up IP routing in general.
A routing entry consists of a destination, a netmask and a gateway. When a
packet is sent to a node outside the network, the IP address to the node is
masked with the netmask of a route. If the masked IP address matches the
destination of the route, the packet is forwarded to the gateway specified in the
route. The gateway must be located on the local IP sub-network.
On each node in the DLE segment, a default gateway routing entry should be
specified, or routes must be specified to all remote destinations. This is used to
determine where to forward packets to nodes outside the DLE segment. The
default route is specified as destination 0.0.0.0 with netmask 0.0.0.0. This entry
will match all IP addresses. The gateway shall be the IP address of the gateway
on the DLE segment.
Node a
Destination: 0.0.0.0
Netmask: 0.0.0.0
Gateway: 192.168.100.33
Node b
Destination: 0.0.0.0
Netmask: 0.0.0.0
Gateway: 192.168.100.1
Destination: 192.168.100.64
Netmask: 255.255.255.224
Gateway: 192.168.100.3
Node c
Destination: 0.0.0.0
Netmask: 0.0.0.0
Gateway: 192.168.1.222
Destination: 192.168.100.32
Netmask: 255.255.255.224
Gateway: 192.168.100.2
Destination: 192.168.100.64
Netmask: 255.255.255.224
Gateway: 192.168.100.3
External node
Destination: 192.168.100.0
Netmask: 255.255.255.0
Gateway: 192.168.1.1
Figure 48. Routing tables for a network as shown in Figure 46
Note:
The node (c) must have two routing entries, in addition to the
default route; one to each network (DLE segments).
Default route
Default route
This route is only necessary if you
want to be able to send packets from
network 192.168.100.32 to network
192.168.100.64.
Default route. The gateway is the
node on the external network that
acts as gateway to other networks.
This might not be any node, in which
case this entry does not exist. In this
example, it is assumed that the
gateway is ... 222, which is not shown
in the figure.
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