From mboxrd@z Thu Jan 1 00:00:00 1970 From: PierrotLafouine Date: Fri, 28 May 2010 15:06:48 +0000 Subject: Question on pppd / =?ISO-8859-1?Q?reset=3F?= Message-Id: <4BFFDC08.9070103@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ppp@vger.kernel.org Hi If I'm not on the good forum, or too specific with my questions, please provide me the address of the good mailing list/forum. We have an application using ppp with a GPRS modem. The system is actually in the field and working 24/7 for several months. Carrier disconnected modem often (IP renewal, maintenance etc.) and modem alway reconnected correctly, except last time. I went onsite for debugging and try different commands to make modem reconnect (ifdown/ifdown, poff/pon, shutdown -r etc...) All commands failed to reconnect the modem. I had to pull the plug to make it connect. My question is about reset. I would like to understand more the stack of the system, and why it failed to reconnect. The GPRS modem is connected trought full RS-232 signals, and RS-232 chips is on an ISA bus. How does ppp deal with this kind of hadware configuration ? I read ppp deal with modem reset, but how ? Any idea what I should look at to understand more the root cause of this failure ? Thanks, Pierre