User's Manual

Table Of Contents
57
A Cordless Gateway Connected to a Wired Network That Has
Shared Internet Access
If the Cordless Gateway connects to a hub on an existing wired network
which has shared Internet access, then the network should consist of a
number of computers each with a Symphony Adapter installed and a
Cordless Gateway connected to a hub with no more than 8 Ethernet devices
attached. A device that provides high speed Internet access, such as an ISDN
router, cable modem, or xDSL modem, is also connected to the hub or is
acting as the hub.
In this scenario, the configuration of the Symphony products is highly
dependent upon the specific design of your network. For example, if the
high-speed device on the network is a DHCP server or if your ISP uses DHCP,
you will want to configure the Cordless Gateway to operate only in Transpar-
ent Bridging mode. This will allow all computers (Ethernet and Symphony)
to be on the same LAN and share files and printers while having simulta-
neous access to the Internet.
Alternatively, if you need the Cordless Gateway to perform NAT due to a
limited number of IP Addresses assigned by the ISP, then the Cordless
Gateway needs to perform both Transparent Bridging and NAT, and the
Symphony Adapters need to retain the dynamic IP Address assignments that
they receive from the Cordless Gateway. In this case, the computers on the
Symphony Cordless Network will have a different IP Address scheme (using
addresses in the 169.254.0.0 network) than the computers on the Ethernet
(using IP Addresses assigned to you by the ISP). Therefore, you need to
install another networking protocol, such as NetBEUI, in order for the
Ethernet and Symphony computers to appear on the same Local Area
Network (LAN) and to share files and printers.
Given the above, Proxim presents the following guidelines for using the
Symphony products in this network configuration:
Changes to Cordless Gateway’s Topology Parameter. If you have a DHCP
server on the network and you want the Symphony-enabled computers to
receive a dynamic IP Address assignment from the network, then configure
the Cordless Gateway to operate in Transparent Bridging mode only. If you
do not have a DHCP server on the network but have available static IP
Addresses that you can assign to the Symphony-enabled computers, then
configure the Cordless Gateway to operate in Transparent Bridging mode
only. If you do not have a DHCP server on the network and do not have