Dialback From Slip/Ppp Mode; Dialback Using Cbcp - Lantronix SCS Reference Manual

Security
To add a user to the dialback database, use the Set/Define Dialback command and specify a username
and a telephone number. If the user must bypass dialback (regardless of whether Dialback Bypass is
enabled or disabled), specify the Bypass parameter.
Local>> DEFINE DIALBACK BYPASS ENABLED
Local>> DEFINE DIALBACK FRANK BYPASS
Local>> DEFINE DIALBACK BOB "555-1235"
In the example in Figure 11-15, user frank will bypass dialback. When user bob attempts to connect,
the SCS will call him back at 555-1235. Any other user attempting to connect will be subject to
dialback; if he or she is not in the dialback database, the attempt will fail.
To view the Dialback database, use the Show/Monitor/List Dialback command.
Local>> SHOW DIALBACK
You must be the privileged user to view the Dialback database.
Note:

11.3.3 Dialback from SLIP/PPP Mode

To authenticate incoming PPP and SLIP callers using dialback, the site managing the incoming connection
must have dialback enabled. Use the Define Site Authentication Dialback command.
Local>> DEFINE SITE irvine AUTHENTICATION DIALBACK ENABLED
Ensure that the correct ports and telephone numbers are defined; the site will use the defined site-specific
or port-specific telephone number to dial the incoming caller. See Telephone Numbers on page 4-17 for
more information.

11.3.4 Dialback Using CBCP

The SCS supports the Microsoft Callback Control Protocol (CBCP) for dial-in PPP clients that request it.
In conjunction with CBCP, the SCS may be configured to allow the PPP client to choose the dialback
telephone number. This form of dialback is referred to as "insecure dialback" because it negates the usual
security provided by dialback. It is primarily used to offer remote users a way to specify a dialback number
to reverse telephone charges.
Insecure dialback may post a security risk. Use it with caution.
Note:
After the CBCP-aware client has connected to the SCS and has passed PPP authentication, and is optionally
switched to a custom site, the SCS will negotiate CBCP (this happens regardless of site dialback settings).
Three callback options are available:
Figure 11-15: Adding Users to the Dialback Database
Figure 11-16: Viewing the Dialback Database
Figure 11-17: Enabling Dialback on a Site
11-7
Dialback