ECLYPSE Controller IP Network Protocols and Port Numbers
ECLYPSE User Guide 27
About Port Numbers
In an IP packet, a port number is an extension of the packet’s IP address and completes the
destination address for a communications session. By convention, the packet’s port number
is associated with a protocol used between software applications and is used to uniquely
identify a communications endpoint for a specific application or process running on a
computer. This allows a multitude of applications to share a single physical connection to the
Internet while allowing distinct communication channels between different applications.
For example, your web browser listens to port 80 on your computer to receive HTML web
pages sent from a web server on port 80.
The standard port numbers used by ECLYPSE controllers is explained in ECLYPSE IP
Network Port Numbers and Protocols on page 28.
Sometimes, two applications might use the same port number to communicate. To sort out
this conflict, the following methods can be used.
In the configuration of some applications, the port number can be changed from its
default setting. Should you change it, you must also change it on the corresponding
application also so that the port numbers will match.
Routers have features such as port forwarding that can change an incoming
packet’s port number coming from the Wide Area Network (WAN) to another port
number on the Local Area Network or vice versa.
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