fc8: Connecting via Dial-up MODEM

[shan_j]

My dial-up modem is a Conexant HSF. I installed its drivers and dialed with wvdial.
and it outputs :
# wvdial
--> WvDial: Internet dialer version 1.60
--> Initializing modem.
--> Sending: ATZ4
ATZ4
OK
--> Modem initialized.
--> Sending: ATDT1250
--> Waiting for carrier.
ATDT1250
CONNECT 115200
--> Carrier detected. Starting PPP immediately.
--> Starting pppd at Sun Mar 15 18:09:36 2009
--> Pid of pppd: 30402
--> Using interface ppp0
--> local IP address 112.134.52.182
--> remote IP address 203.115.1.143
--> primary DNS address 222.165.160.2
--> secondary DNS address 203.115.0.46

BUT I cannot access to internet by Firefox or Lynx. Not even yum install . I Turned off Firewall but Cannot even ping to the DNS.

What could possibly occurred ???
Appreciated if anyone could feel free to help me.

PS:
My message log says
Mar 15 18:18:31 localhost pppd[30525]: pppd 2.4.4 started by root, uid 0
Mar 15 18:18:31 localhost pppd[30525]: Using interface ppp0
Mar 15 18:18:31 localhost pppd[30525]: Connect: ppp0 <--> /dev/ttySHSF0
Mar 15 18:18:32 localhost pppd[30525]: PAP authentication succeeded
Mar 15 18:18:32 localhost pppd[30525]: local IP address 112.134.52.193
Mar 15 18:18:32 localhost pppd[30525]: remote IP address 203.115.1.143
Mar 15 18:18:32 localhost pppd[30525]: primary DNS address 222.165.160.2
Mar 15 18:18:32 localhost pppd[30525]: secondary DNS address 203.115.0.46: