Appendix G: Accessing a Console System with a DSView Software Installation via Dial-up
When a DSView 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 server to the user's workstation.
•
The DSView software passes information to the viewer, such as an authorization key, the IP address and
serial port of the console server.
•
The viewer then accesses the serial port of the console server through an SSH session by passing the
authorization key obtained from the DSView server.
•
The serial session begins.
To ensure constant connectivity, a DSView server can be configured out of band (OOB) that will allow it to call a console
server via modem in the event of a network or Internet failure.
G.1 Installing DSView software out of band
The DSView 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 USB or serial port.
For this installation, the DSView 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 software. The viewer will
then point to the DSView server (not the console server) to establish the SSH connection. The DSView 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 serial viewer would route through the DSView server via
Ethernet. In an error state, the DSView 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. Multiuser
connections would further degrade performance and are not recommended. For this reason, dial-up backup is
recommended as an emergency backup feature only.
G.2 Configuring dial-up for a console server
To configure dial-up to a console server within the DSView software:
1.
In a Units view window containing appliances, select the ACS 800/8000 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 server in the Analog Phone Number field.
2.
Select
DSView Settings - Dial-up,
and click
Enable Dial-up.
3.
Select
Modem Type - Analog.
4. Enter the phone number for the console server you want to use.
5.
Enter the PPP User and select the PPP Auth Protocol in the appropriate fields.
6. For dial-in with callback, enable the dial-back checkbox.
7.
Select
DSView Settings - Dial-up - PPP Password
, then enter and confirm the password needed to access the
ACS 800/8000 console server.
8.
Select
DSView Settings - Dial-up - IP Addresses
.
9. Click
Generate Automatically
to set the IP address automatically, or enter the PPP Local IP address and
Appliance IP address manually.
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