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A consequence of using a different network address for the WDS link between unit A
and B, is that we now need to configure a
routing rule
at units A and B so that the RM-
240 can determine where to send traffic destined for the respective network addresses
of A and B. For example, if unit B receives traffic destined for network 192.168.0.x (i.e.
somewhere on unit A’s network), the routing rule specifies that the traffic must be
forwarded to the end point of the WDS link to unit A. The routing rules for unit B are
shown below (for more information on routing rules, refer to the section “3.11 Routing
Rules”).
The second WDS entry specifies the WDS link to unit C as a WDS router interface with
IP address 169.254.5.3. As with the WDS link to unit A, we use a different IP network
address than the default interface (note that this network address 169.254.5.x is also dif-
ferent to that used for the WDS link to unit A 169.254.0.x, so that these separate WDS
interfaces are not internally bridged). Also, as with the WDS link to unit A, a routing rule
is added to direct traffic destined for the network address of unit C (192.168.6.x). So, in
this example, unit B has a total of three IP addresses: 192.168.5.3 for the default interface;
169.254.0.3 for the WDS link to unit A; and 169.254.5.3 for the WDS link to unit C. Note
that we choose to always use the same
host
address of 3 for unit B on all of its interfaces
regardless of the network address.
The third WDS entry specifies the WDS link to unit D. In the example unit D has the
same network address as unit B, therefore we wish to have the WDS interface link to
unit D bridged with the default interface. Because we don’t specify a router IP address
for the third entry the RM-240 automatically bridges this interface with the default wire-
less interface.
The routing rule for directing traffic to unit A can be seen to specify 192.168.0.0 as the
destination address (the network address of unit A) – because the last byte is zero, this
refers to a route to the network 192.168.0.x (as opposed to a route to an individual
host
). The same rule specifies the address 169.254.0.2 as the gateway address (this is the
WDS Router IP address that unit A has been configured with for its WDS link to unit B).
So, this routing rule effectively tells the RM-240 that any traffic destined for the network
192.168.0.x should be forwarded to unit A via the WDS link. Units A and C would also
require similar pairs of routing rules to direct traffic to the network addresses at the end
points of their respective WDS links. For unit D it would suffice to simply configure unit
B as its default gateway, as unit B would then forward on any traffic destined for units A
and C. Refer to section “3.11 Routing Rules” for further information on routing rules.
The WDS Configuration page is accessible from the “Repeaters” link on any of the con-
figuration web pages. The configurable WDS parameters are summarised below.
Layer 3 bridge
When WDS communications are not required, select
this option (see section “3.7 Normal Operation” for
details on Layer 3 bridge).
WDS
Select WDS to enable Access Point to Access Point
communications.
Bridge Spanning Tree
Protocol
Select this to enable Bridge Spanning Tree Protocol
when the default radio interface is bridged (see section
“3.9 Spanning Tree Protocol”).
