sudo wvdial reports:
--> WvDial: Internet dialer version 1.61 --> Cannot get information for serial port. --> Initializing modem. --> Sending: AT+CGDCONT=1, "IP", "telstra.internet" OK --> Modem initialized. --> Sending: ATDT*99# --> Waiting for carrier. CONNECT 21000000 --> Carrier detected. Starting PPP immediately. --> Starting pppd at Sat Mar 3 09:21:43 2012 --> Pid of pppd: 1965 --> Using interface ppp0 --> Disconnecting at Sat Mar 3 09:21:45 2012 --> The PPP daemon has died: A modem hung up the phone (exit code = 16) --> man pppd explains pppd error codes in more detail. --> Try again and look into /var/log/messages and the wvdial and pppd man pages for more information. --> Auto Reconnect will be attempted in 5 seconds --> Cannot get information for serial port. --> Initializing modem. --> Sending: AT+CGDCONT=1, "IP", "telstra.internet" OK --> Modem initialized. It then repeats the above a number of times. ^CCaught signal 2: Attempting to exit gracefully... --> Disconnecting at Sat Mar 3 09:21:49 2012 I have tried both telstra.bigpond and telstra.internet, makes no difference. Roger
It sounds like you are making some progress at least. I came across this while looking for more information:
http://us.generation-nt.com/answer/sierra-aircard-312u-not-connecting-help-2...
Which basically says that the usb device address is incorrect and needs to be changed.
Try using different USB device files in /etc/sysconfig/network-scripts/ifcfg-ppp0
The line of interest is MODEMPORT=/dev/ttyUSB3 See if maybe ttyUSB0, ttyUSB1, or ttyUSB2 work instead (provided it is using ttyUSB3).
thanks for your help, I just checked , there is no /etc/sysconfig/network-scripts/ifcfg-ppp0 in ubuntu. Roger