guy@rlgvax.UUCP (Guy Harris) (01/10/85)
> Finally, it is desireable that the host treat loss of carrier > as a disconnect and logoff request from the user. Overriding > this feature ... may leave a port logged in after a user has > hung up without logging off. Another user who > dials in shortly thereafter will find him/herself already logged in > as the previous user. Definitely a security-hole. Some systems treat a loss of carrier for greater than N seconds, for some specified small N, as a disconnect and logoff request, but treat the initial loss of carrier as a "freeze output" signal and treat a reappearance of carrier within that N-second window as a "thaw output" signal. This way, a temporary line glitch leaves you logged in with a minimum of output lost, but a permanent disconnection terminates the session. Guy Harris {seismo,ihnp4,allegra}!rlgvax!guy