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Cooper Bussmann 945U-E Wireless Ethernet Modem & Device Server User Manual
57
Rev Version 2.14
inherited from the main page. Therefore, if the encryption method/key are left blank the WDS link will be open.
This example shows the encryption method and keys as being different, but they can be the same or take on
the same method and key as the main wireless interface.
• The second entry configures another virtual WDS client connection but this time to the access point of Site C.
Again, the SSID is the same as the access point, and the router IP is on the same subnet as the access point
In addition to adding these WDS connections, Sites C and D will need a default gateway address configured so
that the modules can determine where to send traffic destined for the other networks. In addition, because Site A
does not know how to get to networks 192.168.5.0 and 192.168.6.0, it requires rules to confirm the routing paths.
A default gateway and one routing rule could be configured, but it is easier to configure two routing rules, as shown
in the example in Figure 55.
Figure 55 Site A Routing Rules
• The first routing rule specifies 192.168.5.0 as the destination with a netmask of 255.255.255.0 (network
address range of Site B). Because the last byte of the destination IP is zero, this refers to the network
(192.168.5.1 – 192.168.5.254) as opposed to an individual host IP. The same rule specifies the address
192.168.0.3 as the gateway address. The routing rule effectively tells the 945U-E that any traffic destined for
network 192.168.5.X should be forwarded to Site B via WDS link address 192.168.0.3.
• The second routing rule is similar, except the destinations IP address range is 192.168.6.0 with a netmask of
255.255.255.0, indicating all traffic for the 192.168.6.X network will be routed through the WDS link address
192.168.0.4. This is the WDS router IP address that Site C has been configured with for its WDS link to Site A.
For more information on routing rules, refer to the “3.17 Routing Rules.”
Unit C and D require some sort of routing rule that will determine how they communicates to networks outside
of their configuration. Similar routing rules as shown above could be configured to direct traffic to these other
networks, but if only one routing path is required a default gateway address can be configured on the Network
page.
Figure 56 Gateway Address
3.17 Routing Rules
When a 945U-E receives an IP frame that is destined for an IP address on a different network, it checks if the
network address matches the network address of one of its own interfaces (hard-wired Ethernet, wireless Ethernet,
or WDS) and forwards the frame appropriately. However, if the IP network address does not match the network
address of any of its interfaces, the 945U-E will forward the frame to its default gateway. In this case, it is assumed
that the default gateway has a valid route to the destination.
In some cases, it is not practical to have just one default gateway. For example, this is true for routed wireless
networks with more than two 945U-E routers, and in some cases when WDS router interfaces are used. If more
than one next-hop router is required, the 945U-E allows for up to 30 routing rules to be configured. A routing rule
specifies a destination network (or host) IP address and the corresponding next-hop router that messages for the
