dial in on serial modem /dev/ttyS0

[Rooney]

i have a serial modem attached to /dev/ttyS0 and i would like to dial in to my gentoo server in case of broadband outage etc,

can any one point me in the right direction as i have looked in to this in the past and had no joy.

[suidzero]

You'll have to take care of two things. First, you need to set up your /etc/inittab file to allow the connection. Something close to this, probably:

s0:2345:respawn:/sbin/agetty 9600 ttyS0

Then you need to attach your modem and program the modem to answer incoming calls. This list of AT commands seems to do the trick:

atf0
at&k0
ats0=1
at&d0
ate0
atq1
at&w
at&w0
at&w1
at&w2
at&v

I'm a little sketchy on what all of these do, but basically they tell the modem to answer on the first ring and save the settings to survive a power cycle.

This works for me, but may not for you, use at your own risk, etc...

Hope this helps!

[Rooney]

thanks for this it is helping although im a little unfamiliar with the AT commands but the modem doesent accept the * ones.

* atf0
* at&k0
ats0=1
* at&d0
ate0
atq1
at&w
at&w0
at&w1
at&w2
at&v

do you know if they are important or not.