PPP - defaultroute

[Louis Fung]

hi, everyone,   I am using RedHat 6.1 RP3 (Gnome RH Dialer) to connect to my ISP, it dial, it connect, ppp0 up, but can't ping to my ISP's nameserver ip, which mean I cannot open any web site.   the /var/log/messages said that the default route is my eth0.   I already have the line defaultroute under /etc/ppp/options file.   any suggestions? thank you for your time.   Louis Fung