Computer Hardware User Manual

141
In this section you can control how IP packets should be directed out of the MCU. You should only change this
configuration if you have a good understanding of the topology of the network(s) to which the MCU is connected.
Configuration of routes is divided into two sections: addition of new routes, and the display and removal of existing
routes.
To add a new route, first enter the details using the table below for reference. When you are satisfied with the details
entered, click to make the addition. If the route already exists, or aliases (overlaps) an existing route,
you will be prompted to correct the problem and try again.
Use these fields to define the type of IP addresses
to which this route applies.
The IP address pattern must be in the dot-
separated IPv4 format, while the mask length is
chosen from a drop-down list.
The mask field specifies how many bits of the
address are fixed; unfixed bits must be set to zero
in the address specified.
To route all IP addresses in the range
192.168.4.128 to 192.168.4.255 for example,
specify the IP address as 192.168.4.128 and the
mask length as 25, to indicate that all but the last
seven bits address are fixed.
Use this field to control how packets destined for
addresses matching the specified pattern are
routed. You may select Port A, Port B or Gateway.
If the latter option is selected, you must specify
the IP address of the gateway to which you want
packets to be directed.
Selecting Port A results in matching packets being
routed to Port A's default gateway (see
Configuring network settings). Selecting Port B
will cause matching packets to be routed to Port
B's default gateway.
If Ethernet Port B is disabled, the option to route
packets to Port B will be disabled.
Configured routes are listed below the Add IP route controls. For each route, the following details are shown:
The IP address pattern and mask
Where matching packets will be routed, with the possibilities being:
o Port A - meaning the default gateway configured for Port A
o Port B - meaning the default gateway configured for Port B
o IP address - a specific address has been chosen
Whether the route has been configured automatically as a consequence of other settings, or added by the
user as described above.