"Paul D. Robertson" wrote:
>
> Don't forget when doing dial-back that you *have* to make sure the modem
> is set to drop carrier when it loses DTR (and that the application drops
> DTR and your serial cable is complete enough to have DTR, DSR and DCD
> lines- not a wired-together cheapo hybrid...)
The converse should also be checked... the modem should drop DCD when
carrier drops and the application responds appropriately. Traditionally,
this would signal a multi-user OS to logoff an interactive user if they
hung up the phone assuming the system's line protocols were configured
correctly. It may have similar functionality for other applications...i.e.
it may cause PC Anywhere to log out a user if the carrier drops. The
application may also need corresponding configuration. Without this, the
next user dialing in gets the previous user's session if timeouts haven't
intervened.
--
Gary Flynn
Security Engineer - Technical Services
James Madison University
Please RUNSAFE
http://www.jmu.edu/computing/info-security/engineering/protecting_yourself.htm
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