pppd и восстановление связи.

/etc/ppp/options # General configuration options for PPPD: lock defaultroute noipdefault modem /dev/ttyS0 115200 #crtscts # Uncomment the line below for more verbose error reporting: debug # If you have a default route already, pppd may require the other side # to authenticate itself, which most ISPs will not do. To work around this, # uncomment the line below. Note that this may have negative side effects # on system security if you allow PPP dialins. See the docs in /usr/doc/ppp* # for more information. #noauth #-detach #demand passive asyncmap 0 passive mru 296 mtu 312 /etc/ppp/script TIMEOUT 60 ABORT ERROR ABORT BUSY ABORT "NO CARRIER" ABORT "NO DIALTONE" "" ATZ OK "atdp731111" TIMEOUT 80 CONNECT "" Username: 1 Password: 2 Дозвон по времени через cron или читай man pppd