Quoting israel.garcia@xxxxxxxxxxxx:
Just terminal access -> I want to login in my linux server connecting
through the modem connected in /dev/ttyS0
Not sure if this is complete.
Install mgetty if not already present on your system.
Go to /etc/mgetty+sendfax directory. If you have CallerID feature on
your phone line (and you should get it if you don't have it yet), edit
dialin.config file and add telephone numbers you will be dialing from.
At least this will prevent clueless script-kiddies from getting
login prompt on your modem line. I know that some of my modems get
regullary probed from strange phone numbers (and those are dedicated
modem lines -- no voice calls on them, not listed in white pages, too
often on too many lines to be the simple case of wrong number).
While there, check login.config file. If you don't want PPP on it,
make sure /AutoPPP/ is commented (should be default). Make sure "* -
- /bin/login @" line is not commented (should be last line in the
default config file). That's the line that will give you login prompt.
Edit /etc/inittab and add something like this:
s0:2345:respawn:/sbin/mgetty -D -n 2 -s 115200 /dev/ttyS0
The "-n 2" tells mgetty to pick up the phone after second ring. You
need to wait till second ring because telephone company sends CallerID
information between first and second ring. If you configured mgetty
to answer after first ring, it would never get CallerID information.
Execute "telinit q" as root (this tells init process to reread inittab file).
Configure and connect modem and you should be set to go. I do not
recommend allowing root to login directly from modem line (could be
configured by editing /etc/securetty and /etc/security/access.conf
files if needed, but not wise idea). Login as normal user, than su to
root.
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