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IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.1 223
Introduction
The Security group includes the following configuration options:
z Authentication—When a serial port is configured for the
Console Management or TCP Sockets profile, the user can be
authenticated either locally in the IOLAN user profile or
externally. This option configures the external authentication
server. See
Authentication for more information.
z SSH—This configuration window configures the SSH server in
the IOLAN. See
SSH for more information.
z SSL/TLS—This configuration window configures global
SSL/TLS settings, which can be overridden on the serial port
level. See
SSL/TLS for more information.
z VPN—This configuration window configures the Virtual Personal Network (VPN) IPsec and
L2TP/IPsec tunnel parameters. See
VPN for more information.
z HTTP Tunnel—This configuration window configures the Http Tunneling parameters. See
HTTP Tunneling for more information.
z Services—This configuration window is used to enable/disabled client and daemon services that
run in the IOLAN. See
Services for more information.
Authentication
Authentication can be handled by the IOLAN or through an external authentication server.
Authentication is different from authorization, which can restrict a user’s access to the network
(although this can be done through the concept of creating sessions for a user, see
Sessions Tab for
more information). Authentication ensures that the user is defined within the authentication
database—with the exception of using the
Guest authentication option under Local Authentication,
which can accept any user ID as long as the user knows the configured password.
For external authentication, the IOLAN supports RADIUS, Kerberos, LDAP/Microsoft Active
Directory, TACACS+, SecurID, and NIS. You can specify a primary authentication method and a
secondary authentication method. If the primary authentication method fails (cannot connect to the
server or authentication fails), the secondary authentication method is tried (unless you enable the
Only Use as backup option, in which case the secondary authentication method will be tried only
when the IOLAN cannot communicate with the primary authentication host). This allows you to
specify two different authentication methods. If you do specify two different authentication methods,
the user will be prompted for his/her username once, but will be prompted for a password for each
authentication method tried. For example, user Alfred’s user ID is maintained in the secondary
authentication database, therefore, he will be prompted for his password twice, because he is not in
the primary authentication database.Unlike the other external authentication methods, RADIUS and
TACACS+ can also send back
Serial Port and User parameters that are used for the duration of the
Configuring Security Chapter 9
9