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Fw: GPRS PPP Carrier Detect.


I have a Debian GNU/Linux 3.1 Intel x86 installation that has pppd version 2.4.3.

I have a GPRS modem connected to /dev/ttyS0.
I can connect and get a ppp0 interface.
When I unplug the GPRS modem from the serial port I can
see the modem signals change state including CD (Carrier Detect):

>From : 0: uart:16550A port:000003F8 irq:4 tx:2276 rx:2864 RTS|CTS|DTR|DSR|CD
To : 0: uart:16550A port:000003F8 irq:4 tx:2329 rx:2911 CTS|DSR

But pppd does not close the connection and the ppp0 interface remains available.

If I do the same test on Fedora Core 3 that has pppd version 2.4.2 all works 100%.

Can anyone confirm this and possibly give a solution?

I have tried different combinations of "crtscts", "cdtrcts" and "modem" with no good result.



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