User's Manual

Elpro Technologies 450U-E Wireless Ethernet Modem & Device Server User Manual
Rev Version 1.4.0 www.cooperbussmann.com/wirelessresources 27
section 3.6 below for details)
Device Mode
Used to select Bridge or Router mode.
IP addresses and Netmasks are required for the Ethernet and Wireless
interfaces.
By default this is set to Bridge.
Bridge STP
Checking this box enables Spanning Tree protocol in bridged networks. See
to section 0.0 Bridge STP (Spanning Tree
Obtain IP Address
Automatically
Checking this item enables DHCP client on the 450U-E. A DHCP client
requests its IP address from a DHCP server which assigns the IP Address
automatically. For more information, refer to section 4.11 DHCP Client
Configuration default is unchecked.
IP Address
Bridge Mode - The IP address of the 450U-E module. Both wired (Ethernet
Interface) port and wireless (Wireless Interface) ports will take on this
address.
Router Mode Separate IP addresses are required for each interface. IP
addresses must be different.
IP Subnet Mask
The IP network mask of the 450U-E module. This should be set to
appropriate subnet mask for your system (Typically 255.255.255.0). In
Router mode each interface will have its own Netmask.
Default Gateway
This is the address that the device will use to forward messages to remote
hosts that are not connected to any of the local bridged network (Ethernet or
Wireless). This is only required if the wired LAN has a Gateway unit which
connects to devices beyond the LAN - for example, Internet access. If there
is no Gateway on the LAN, set to the same address as the Access Point -
3.10 IP Routing
for more information.
Save Changes
Save changes to non-volatile memory. The module will need to be restarted
before the changes take effect.
Save Changes and Reset.
Save settings to non-volatile memory, and reboot 450U-E. Once the module
has completed the reboot sequence, all changes are in effect.
Device Mode
The Device Mode allows selection between a Bridge and a Router, each mode is explained in more detail below. When
Router is selected you will notice the screen will display a separate IP address for each interface (Ethernet and Wireless).
The default mode is Bridge which only requires one interface IP address.
Bridge Operation (Transparent Network)
A bridge connects several Ethernet networks together, and makes them appear as a single Ethernet network to higher
protocol layers.
By default, the 450U-E is configured as a transparent bridge. When a transparent bridge is started, it learns the location of
other devices by monitoring the MAC address of all incoming traffic. Initially it forwards all traffic between the wired
Ethernet port and the wireless port, however by keeping a list of devices heard on each port, the transparent bridge can
decide which traffic must be forwarded between ports - it will only transfer a message from the wired port to the wireless
port if it is required.
A bridge will forward all Broadcast traffic between the wired and wireless ports. If the wired network is busy with
broadcast traffic, the radio network on the 450U-E can be unnecessarily overburdened. Use filtering to reduce broadcast
traffic sent over the radio. Refer Section 3.11 Filtering
By default, a transparent bridge does not handle loops within the network. There must be a single path to each device on
the network. Loops in the network will cause the same data to be continually passed around that loop. Redundant
wireless links may be set up by enabling the bridge Spanning Tree Protocol (see section 0.0 Bridge STP (Spanning Tree
Protocol)