wvdial problem

[freeburn]

i use a dialup modem for internet access. i have always used wvdial in
my ubuntu. but in fedora there seems to be a problem. because when i
dial wvdial it shows that connection established, it also give the dns
server adress. and my modem screen does start a time counting like
usual. but still i cant surf the internet. one of my friend suggested to
disable eth0 before dialing ,i've done that too.