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а по поводу автодозвона в Линухе, то в настройках соединения tcnm gfhfvtnhs
persist
Do not exit after a connection is terminated; instead try to reopen the connection.
и
demand Initiate the link only on demand, i.e. when data traffic is present. With this option, the remote IP address
must be specified by the user on the command line or in an options file. Pppd will initially configure the
interface and enable it for IP traffic without connecting to the peer. When traffic is available, pppd will con-
nect to the peer and perform negotiation, authentication, etc. When this is completed, pppd will commence pass-
ing data packets (i.e., IP packets) across the link.

т.е. одна автодозвон после обрыва, а вторая автодозвон по .... ээээ.... как бы это сказать то по русски %о))
вообще по требованию, по обращению из сети чтоли...