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POpppd stuck in dialing process
 

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    <p>i'm connecting several usb modems to my Ubuntu:<br> <code>uname -a<br> Linux devlp 2.6.32-28-generic #55-Ubuntu SMP Mon Jan 10 21:21:01 UTC 2011 i686 GNU/Linux<br> pppd version: 2.4.5 </code></p> <p>i'm doing a test with 8 sierra wireless modems, and all of them are connected and work. each of them has a "ppp" interface.<br> after they are connected, i'm trying to reconnect ppp7, and at first, pppd fails, then in the second try it reaches the point where it says: "Serial connection established" and stuck. i tried all kill signals to kill that pppd without success, and the only way to terminate it is to plug-out the modem it tried to dial.<br> i looked for the exact place where the pppd get stuck and it's right over here:</p> <pre><code>int generic_establish_ppp (int fd) { int x; if (new_style_driver) { int flags; FILE *f=fopen("/root/ptest.log","a"); fputs("before get channel\n",f); fflush(f); /* Open an instance of /dev/ppp and connect the channel to it */ if (ioctl(fd, PPPIOCGCHAN, &amp;chindex) == -1) { // &lt;&lt;&lt;&lt;&lt;&lt;&lt; STUCK HERE error("Couldn't get channel number: %m"); goto err; } fputs("after get channel\n",f); .... } } </code></pre> <p>it looks like the problem is specifically with ppp7 - and it can be any modem so i don't think it's a modem problem, but what i don't understand is what really happens in that command? who is responsible for the answer? is it only the kernel? the modem driver? the modem itself? i don't quite understand what to do with that information since PPPIOCGCHAN documentation is very poor..</p> <p>i thought at first that maybe pppd is not releasing the channel or ppp after disconnect so i compiled my own pppd version and added PPPIOCDISCONN and PPPIOCDETACH just to make sure my version is fine with that, and the results were the same.<br> what you think?</p>
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