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Appendix D: Accessing a Console Server with a DSView 3

Software Installation via Dial-up

When a DSView 3 software user establishes a serial session, the following events occur:

• The user selects a serial port to access.

• A viewer is downloaded from the DSView 3 server to the user's workstation.

• The DSView 3 software passes information to the viewer, such as an authorization key, the console

server's IP address and serial port.

• The viewer then accesses the console server's serial port through an SSH session by passing the

authorization key obtained from the DSView 3 server.

• The serial session begins.

To ensure constant connectivity, a DSView 3 server can be configured with an out of band (OOB) “back door”

that will allow it to call a console server via modem in the event of a network or Internet failure.

Installing DSView 3 software with an OOB back door

The DSView 3 server must be running on hardware that has a connected modem, and the console server must

have a built-in modem or access to a modem via a PCMCIA card, USB or serial port.

For this installation, the DSView 3 server must be the central point of reception of both the packets leaving the

downloaded viewer and the console server. To ensure this, Proxy mode must be configured within the DSView 3

software. The viewer will then point to the DSView 3 server (not the console server) to establish the SSH

connection. The DSView 3 server would then route the packets by changing both the source and destination IP

addresses and act as a middle point of communication.

Under normal operating conditions, packets received from the Video Viewer would route through the DSView 3

server via Ethernet. In an error state, the DSView 3 server would detect that the normal path to the console server

was interrupted and would dial out to the console server, pass authentication and establish a PPP connection.

Packets that would normally pass via Ethernet would instead be routed via PPP.

Because of the speed differences between Ethernet and dial-up, performance would be notably slower, but still

present. Multiuser connections would further degrade performance and are not recommended. For this reason,

dial-up backup is recommended as an emergency backup feature only.

Configuring dial-up for a console server

To configure dial-up to a console server within the DSView 3 software:

In a Units view window containing appliances, select the ACS 6000 console server you want to configure. For

dial-in with callback, you must first select DSView Server - Properties - DSView Modem Sessions under the

System tab and enter the the phone number assigned to the DSView 3 server in the Analog Phone Number field.

Select DSView Settings - Dial-up, and click Enable Dial-up.

Select Modem Type - Analog.

Enter the phone number for the console server you want to use.

Enter the PPP User and select the PPP Auth Protocol in the appropriate fields.

For dial-in with callback, enable the dial-back checkbox.

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Avocent Network Adapter EMS1000P Guía de usuario Pagina 70