From owner-freebsd-net@FreeBSD.ORG  Wed Oct 26 20:21:42 2005
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From: "Jordon Hofer" <jhofer@agsense.net>
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Date: Wed, 26 Oct 2005 15:21:45 -0500
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Subject: Cellular Modem, PPP, and FreeBSD
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Greetings.  I am running a stripped down version of FreeBSD 4.11 on an
embedded x86 board.  I have an embedded cellular modem module (from
MultiTech) that is attached to the serial port (going through the necessary
RS232-TTL chip).  I am using PPP to connect to the Internet through verizon.
Everything works well until the connection gets interrupted.  I am using
ddial mode, so if the connection drops, it will redial.  From the logs, I
can see that PPP tries to redial, but after the initial connection, the
modem does not respond to any at commands.  If I power-cycle the modem, it
will connect just fine the next time PPP tries to reconnect.

I realize that there is a good chance that the problem is in the modem.  I
am just wondering if there are any cases where you need a special chat
script to handle disconnects to return the modem to a clean state.

Also, if there is a better group for this, please let me know.

Thanks.


Jordon Hofer
Dir. Software Engineering
AgSense LLC