pppd and Airlink Pinpoint CDMA modem woes
Can anyone help me with a problem I am having?
I have a linux-based device connected via serial port to a pinpoint CDMA modem. <http://www.airlink.com/info/pinCDMA_mkt.asp> I have had this working (about 3 months ago), but now when I try to establish a ppp connection, I get errors (see below). Here are the relevant files: bash-2.05# cat /etc/ppp/peers/airlink /dev/ttyS0 115200 noipdefault mtu 1024 mru 1024 modem lock crtscts defaultroute lcp-echo-failure 0 lcp-echo-interval 0 novj persist connect '/usr/sbin/chat -s -v -f /etc/ppp/chat-airlink' bash-2.05# cat /etc/ppp/chat-airlink "" "AT" OK "AT&D0" OK "ATD#19788" bash-2.05# And here is my command to establish the connection: bash-2.05# pppd call airlink And here is the log output: bash-2.05# tail /var/log/messages ... Oct 24 00:24:14 hummer pppd[682]: pppd 2.4.1 started by root, uid 0 Oct 24 00:24:15 hummer chat[683]: send (AT^M) Oct 24 00:24:15 hummer chat[683]: expect (OK) Oct 24 00:24:19 hummer chat[1105]: ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ Oct 24 00:24:55 hummer last message repeated 5 times Oct 24 00:24:55 hummer chat[1105]: ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ Oct 24 00:25:00 hummer chat[1105]: alarm Oct 24 00:25:00 hummer chat[1105]: Failed The really odd thing is, if I connect to the pinpoint modem using minicom via /dev/ttyS0 at 115200 baud and issue the AT commands manually, I get the expected replies, AT OK AT&D0 OK ATD#19788 CONNECT The differences (of which I am aware) are that I have an ipsec tunnel over a wireless ethernet link, the GPS output to an IP feature of the pinpoint modem was enabled, and I'm using a different SBC. We are updating the firmware on the modem, but is there anything you see here that I am doing wrong? No I haven't tried connecting to a regular telephone modem via the serial port, I don't have any of those handy at the moment. Thanks for any help. -bbeers |
Well ... not too many folks using this device, I guess.
It turns out I was doing everything right, but it just won't work while the ipsec is running. After bringing down the ipsec connection, I was again able to bring up the ppp connection to the modem. I don't know why there is a conflict there, but there is. Maybe this extra bit of info will be useful. Maybe someone reading this will know what the conflict is and tell me how to work around it -- besides shutting off my ipsec. Just thought the 40-someodd of you who were curious enough to read the thread might be interested. -bbeers |
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