Revision 3.1
WebRelay
TM
Users Manual
routable IP address. Many small routers from LinkSys, Dlink, and Netgear perform proxy
server functions. If a proxy server is used, WebRelay
TM
will not be accessible from the
Internet until the proxy server is properly configured (forward proper port to WebRelay
TM
).
This information is mentioned for convenience but details of setting up a configuration
such as this is beyond the scope of this manual.
If WebRelay
TM
is used on a private network only and is NOT used over the Internet, a
routable IP address is not necessary. This may be the case when WebRelay
TM
is used to
control (or monitor) a device in another room or a nearby building.
If WebRelay
TM
will be installed on a simple, private network that does not connect to the
Internet, the default IP address may be used as long as no other device on the network uses
the same address. If multiple WebRelay
TM
units are installed on the same network, each
unit must have its own unique IP address. For example, WebRelay
TM
comes from the
factory with a default IP address of 192.168.1.2. If multiple units are used, change the IP
address for each unit (192.168.1.3, 192.168.1.4, 192.168.1.5 etc.).
2. Netmask:
This specifies the size of the local network. This must be obtained from the network
administrator. By default, the netmask is set to 255.255.255.0.
3. Broadcast:
This specifies the broadcast address. This must be obtained from the network
administrator. By default, this is set to 192.168.1.255.
4. Gateway:
This specifies the IP address of the gateway router. This must be obtained from the
network administrator. By default, this is set to 192.168.1.1.
5. TCP Port:
This specifies the TCP port used for communications with WebRelay
TM
. By default, the
port is set to 80 which is the standard http port. It is recommended that the port not be
changed without an understanding of TCP/IP and ports.
Changing the port can be useful for accessing multiple WebRelay
TM
devices which are
installed behind a gateway router on a private network that uses non-routable IP addresses
(192.168.x.x, 10.x.x.x, and 172.16.x.x through 172.31.x.x are non-routable or private IP
addresses). In this case, each WebRelay
TM
unit would be assigned a different port (for
example 8000, 8001, 8002, etc). The gateway router would be set up to forward all traffic
for each of the assigned ports to the IP address of the WebRelay
TM
unit which uses that
port. The WebRelay
TM
units could then be accessed from outside the private network by
entering the IP address of the gateway and the port for the desired WebRelay
TM
unit. Note
that whenever any port is assigned other than port 80, all communications with that
WebRelay
TM
device must include the port. For example, if WebRelay
TM
is assigned port
8000, access to the setup page would require the following URL to be entered;
http://192.168.1.2:8000/setup.html.
An example screenshot of a gateway router configuration is given below. This setup
allows seven ControlByWeb
TM
products to be accessed on a private network behind a
gateway router. Note that this screenshot is simply an example of a typical router setup
page. Routers will vary.
Xytronix Research & Design, Inc.
page 24