Can't get PPP dial out to work

I installed SuSE 8.0 this morning and have been unable to get PPP dial out to connect with my ISP. The same thing happens whether I use wvdial or kppp. The modem dials and there is a connection and I get a message that pppd is started but there is no connection. I can't ping my ISP nor can I used my browsers or get or send e-mail. I've never had this kind of problem with earlier versions of SuSE nor with Debian, Red Hat or Slackware in the past. Anyone else having a problem? Any suggestions on where to look would be appreciated.