Appendix C: Accessing Webrelay-10Tm Over The Internet - Xytronix Research & Design WebRelay-10 X-WR-10R12-I User Manual

WebRelay-10 Users Manual
Appendix C: Accessing WebRelay-10
WebRelay-10 can be monitored and/or controlled from a remote location over the Internet. Once
WebRelay-10 can be accessed on the local network, almost all of the settings required to provide
remote access are in the router and not in WebRelay-10. This guide is not meant to be a tutorial in
router setup, but rather to provide a basic overview of remote access. For specific details, the user
should refer to the instruction manual for the router on the local network. Users not familiar with basic IP
networking should study one or more basic IP networking tutorials before proceeding (many tutorials are
available on the Internet).
IP Addresses
Every device on the Internet is identified by a unique address called an IP (Internet Protocol) address. IP
addresses are somewhat similar to mailing addresses in that they identify the precise logical location of
the device on the Internet. The IP address identifies the global region down to the network and then the
specific device on that network. IP addresses are globally maintained and assigned by an entity called
the Internet Assigned Numbers Authority (IANA). IP addresses consist of four numbers that range from 0
to 255 and are separated by a decimal. For example, 192.168.200.167 is an IP address.
Every device that is "directly" connected to the Internet uses a "public" IP address. WebRelay-10 can be
assigned a public IP address for direct connection to the Internet. Typically, a public IP address to would
only be assigned to WebRelay-10 when it is the only device on the local network. The IP address would
be obtained from an Internet Service Provider (ISP).
Due to the limited number of public IP addresses, private networks can be set up with "private" IP
addresses. These addresses are used withing a local network and have no global designation, they are
not routed on the Internet. The following address blocks are designated for private networks (where x
represents decimal numbers from 0 to 255): 192.168.x.x, 10.x.x.x, and 172.16.x.x.
A Simple Local Area Network
A small Local Area Network (LAN), can be made up of two or more computers or other devices
connected to an Ethernet switch. Each device on the network is assigned a unique private IP address.
For example, consider a simple network that consists of a computer, a WebRelay-10, and a
WebRelay™. In this example, the computer is assigned an IP address of 192.168.1.10, WebRelay-10
has the IP address of 192.168.1.25 and a WebRelay™ has and IP address of 192.168.1.26. A person
using the computer can access WebRelay-10 by entering its IP address in the URL line in the
browser,http://192.168.1.25. Similarly, WebRelay™ can be accessed by entering its unique private IP
address in the URL line in the browser, http://192.168.1.26.
Xytronix Research & Design, Inc.

Appendix C: Accessing WebRelay-10TM Over the Internet

Over the Internet
TM
page 83