Visara CNA-8000 Installation - Manual (Page 107)

CNA-8000 Installation and Configuration
707158-003 10-3
Configuring Listen Ports
The CNA-8000 will listen for TN3270 clients only on the TCP ports that have been
configured for listening. Clients attempting to connect to a TCP port that has not been
configured will be turned away by the CNA-8000, and an NVT message indicating that
the CNA-8000 rejected the connection should be sent.
To configure the TCP ports that will be listened to, select the [Ports] button on the
TN3270 Configuration Panel. The resulting panel will appear.
This panel allows you to define which TCP ports the CNA-8000 is to listen on and
whether traffic through the port is to use SSL encryption. Ports can be added to the list by
pressing the [New] button. Ports can be deleted from the list by selecting the port that you
wish to eliminate and pressing the [Delete] button. Before leaving the panel you will need
to press the [Update] button to save any changes that you have made.
The Ports dropdown box contains a list of all of the ports that have configured for
listening. A port only needs to be added one time. Any number of users may connect
through the same port if configured to do so. Port 23 is the default port for Telnet, which
TN3270 is part of. Most TN3270 clients will also default to use Port 23. For security
purposes and to avoid attempting to use other commonly assigned ports in the IP world,
the CNA-8000 permits port assignments of 23 and in the range of 1026 and higher.
Configured ports are available through any of the Ethernet adapters configured on the
platform.