problems detecting a broken connection

[Matthias Kaehlcke]

Hi,

I experience problems with the detection of a broken connection using
pppd v2.4.4 for a GPRS connection. From time to time the connection
goes done (probably due to bad GSM coverage). I'd like to be able to
detect this case and force a reconnection. The parameter pair lcp-echo-
interval and lcp-echo-failure seem to be the appropiate tool for this
purpose, so i specified

lcp-echo-interval 60

lcp-echo-failure 3

in the ppp options file

My test case consists in disconnecting the GSM antenna after the
connections is established. After 3 minutes I'd expect a reaction of
the pppd daemon, but nothing happens.

The system runs a 2.6.30 Linux kernel on an ARM processor

Any idea what could be the problem?

Best regards

Matthias