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Network Mask
255.255.255.255
If, however, you want to allow all the users operating from within a specific range of IP
addresses (for example, any of the thirty addresses from 204.15.5.129 to 204.15.5.158) to
be permitted connection to the nominated port:
Host /Subnet Address
204.15.5.128
Subnet Mask
255.255.255.224
Click Apply.
Note The above Trusted Networks will limit Users and Administrators access to the console serial
ports. They do not restrict access to the console server itself or to attached hosts. To change the
default settings for this access, you will to need to edit the IPtables rules as described in Chapter
14—Advanced.
4.6 Serial Port Cascading
Cascaded Ports enables you to cluster distributed console servers. A large number of serial ports (up to
1000) can be configured and accessed through one IP address and managed through one Management
Console. One console server, the Master, controls other console servers as Slave units and all the serial
ports on the Slave units appear as if they are part of the Master.
Black Box’s clustering connects each Slave to the Master with an SSH connection. This uses public key
authentication so the Master can access each Slave using the SSH key pair (rather than using
passwords). This ensures secure authenticated communications between Master and Slaves, enabling
the Slave console server units to be distributed locally on a LAN or remotely around the world.
4.6.1 Automatically generate and upload SSH keys
To set up public key authentication, you must first generate an RSA or DSA key pair and upload them
into the Master and Slave console servers. This can all be done automatically from the Master.
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