Problem on dial up connection for sim900 module to rspberry pi

[sethuraman]

hi


I have set up a like bellow sim900 GSM module to interface with raspberry pi. I believe I have established a gprs connection to AT&T though wvdial

am following above steps but i cant connect internet my raspberry pi
am try to ping google.com
i am unable browse the internet please help me how to resolve this problem give me the guidance to resolve this problem thanks in advance

sudo ifdown eth0
sudo ifdown wlan0
sudo poff -a
sudo pon internet


sudo ifdown eth0
sudo ifdown wlan0
sudo poff -a
sudo pon internet


    /etc/wvdial.conf

[Dialer Defaults]
Modem Type = Analog Modem
Modem = /dev/ttyAMA0
Baud = 115200
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2
Init3 = AT+CFUN=1
Init4 = AT+CGATT=1

[Dialer internet]
Init5 = AT+CGDCONT=1,"IP","CMNET"
Phone = *99***1#
Username = cmnet
Password = cmnet
;Ask Password = 0
Dial Command = ATDT

;Carrier check = off
Stupid mode = on
;Compuserve = 0
Idle Seconds = 0
New PPPD = yes
ISDN = 0
;Auto DNS = 1
Check Def Route = 1

    /etc/ppp/peers/internet

name wvdial
connect "/usr/bin/wvdial --chat internet"
/dev/ttyAMA0
115200

modem
nocrtscts
#usepeerdns
noipdefault
ipcp-accept-local
ipcp-accept-remote
defaultroute
noauth
persist
#demand
debug
logfd 6
#idle 180