Step 2: Check the /var/log/message or use 'dmesg|tail, to verify that kernel has detected the device or not. Once detected, it will show the device name
pcmcia: the driver needs updating to supported shared IRQ lines.
ttyS3: detected caps 00000700 should be 00000100
0.0: ttyS3 at I/O 0x2e8 (irq = 185) is a 16C950/954
If message show that some hardware has attached but showing some error then its kernel issue. xen kernel and some other 2.6.18.xx kernel have issue with serial port.
Step 3: check the baud_base of attached device by using
for serial device :
setserial -a /dev/ttyS3
[root@manoj-pc ~]# setserial -a /dev/ttyS3
/dev/ttyS3, Line 3, UART: 16950/954, Port: 0x02e8, IRQ: 185
Baud_base: 115200, close_delay: 50, divisor: 0
closing_wait: 3000
Flags: spd_normal skip_test
Step 4: check whether device is responding for modem init strings and determine the speed of modem upto which it will give the optimum speed , by using command:
wvdialconf /tmp/wvdial.conf
[root@manoj-pc ~]# wvdialconf /tmp/wvdial.conf
Scanning your serial ports for a modem.
Port Scan<*1>: S0 S1 S2
ttyS3<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud
ttyS3<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 115200 baud
ttyS3<*1>: ATQ0 V1 E1 -- and failed too at 115200, giving up.
Sorry, no modem was detected! Is it in use by another program?
Did you configure it properly with setserial?
Please read the FAQ at http://open.nit.ca/wvdial/
If you still have problems, send mail to wvdial-list@lists.nit.ca.
Note: if the device is not responding, change the baud_base value of serial device
Step 5: setserial /dev/ttyS3 baud_base 921600
[root@manoj-pc ~]# wvdialconf /tmp/wvdial.conf
Scanning your serial ports for a modem.
Port Scan<*1>: S0 S1 S2
ttyS3<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud
ttyS3<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 115200 baud
ttyS3<*1>: ATQ0 V1 E1 -- OK
ttyS3<*1>: ATQ0 V1 E1 Z -- OK
ttyS3<*1>: ATQ0 V1 E1 S0=0 -- OK
ttyS3<*1>: ATQ0 V1 E1 S0=0 &C1 -- OK
ttyS3<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 -- OK
ttyS3<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
ttyS3<*1>: Modem Identifier: ATI -- ZTEiT MODEM
ttyS3<*1>: Speed 230400: AT -- Speed 230400: AT -- Speed 230400: AT -- Max speed is 115200; that should be safe.
ttyS3<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
Found a modem on /dev/ttyS3.
Modem configuration written to /tmp/wvdial.conf.
ttyS3
Step 6: Using /tmp/wvdial.conf , create /etc/wvdial.conf as given below:
[Dialer Defaults]
Modem = /dev/ttyS3
Baud = 115200
SetVolume = 0
Dial-AT-OK ATDT Command =
Init1 = ATZ
FlowControl = Hardware (CRTSCTS)
Phone = #777
Username =
Password =
New PPPD = yes
Carrier Check = no
Stupid Mode = 1
Auto Reconnect = on
Step 7: now run
wvdial
Now u will get connect.
Also don't forget to add dns entry in /etc/resolve.conf , that u get from wvdial.
Step8: Instead of wvdial one can also use kppp or equivalent utility to surf.
Only trick is that some modem only respond when there is baud_base (used for serial device) vs baud rate (used in wvdial.conf for modem speed) have some specific ratio. Eg. for zte mc315 data card will respond for baud_base 921600 and baud 115200, ie. baud_base/baud=8.
