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245U-E Wireless Ethernet Modem User Manual
Rev Version 2.24
each device on LAN A that needs to communicate with LANs B and C to have independent routing rules
specifying the 245U-E clients at B and C as gateways to those networks.
The routing rules for the access point in the Figure 63 are shown in Figure 64. The first entry shows the
route to LAN B. The gateway for the route to LAN B is configured as the wireless IP address of the 245U-E
client connected to LAN B. The destination for the route is configured as the network address of LAN B.
Because the host ID of the destination IP address is 0, it specifies a network address. Consequently, any
traffic received at the access point with destination IP address 169.254.109.x (where x is any host ID) will be
forwarded to the 245U-E at LAN B.
Devices on LAN B and LAN C that need to send messages back to LAN A will need to have their gateway
addresses directed to the 245U-E on their respected networks (for example, a LAN B device needs to send
data back to LAN A). The gateway address will need to be configured as 169.254.109.40 because this is the
IP address of the wired side of the LAN B 245U-E. Any message coming in with a 192.168.0.X IP address will
be directed across the wireless interface to LAN A.
The Routing Rules configuration page can be accessed by selecting the “Routing” link on any of the
configuration webpages. Up to 30 routing rules may be added to each 245U-E.
Figure 64
Routing Rules
The table below summarizes the configurable parameters of a routing rule.
Name
A name that describes the routing rule (maximum 32 characters).
Destination
The destination network (or host) IP address. To specify a network address, set
the host address to 0. For example, an IP address 192.168.0.0 with netmask
255.255.255.0 would specify a destination network, while 192.168.0.16
specifies a destination host.
Subnet Mask
The subnet mask for the destination network.
Gateway
The IP address of the next-hop router for the specified destination.
Enabled
Select this checkbox to enable the rule. You can clear the box to disable a
routing rule without needing to re-enter the information at a later time.
NOTE Entering dedicated Ethernet routes can also be added to the wired Ethernet LAN in place of
generating or adding routing rules into the modems.
3.19 Filtering
When configured as a bridge, the 245U-E will transmit all broadcast messages appearing at its wired
Ethernet port. When the 245U-E is configured as a router, this does not occur. In many cases, the intended
recipient of the broadcast traffic does not lie at the opposite end of a proposed radio link. Reducing
unnecessary broadcast traffic sent over the radio link will increase available bandwidth for data. The 245U-E
has a filtering feature to help reduce unnecessary wireless transmissions and enhance security.