KPPP拨号成功，但无法浏览网页

[weixin_38060336]

我用KPPP拨号是成功了，但是在shell中用 ping 202.101.172.35 ，提示：
ping: sendto: No route to host

过一段时间，连接自动断开，错误日志为：
Apr 3 23:49:15 pppd[198]: pppd 2.3.5 started by root, uid 0
Apr 3 23:49:15 pppd[198]: Connect: ppp0 <-->; /dev/cuaa0
Apr 3 23:49:15 pppd[198]: No secret found for PAP login
Apr 3 23:49:45 pppd[198]: No response to PAP authenticate-requests
Apr 3 23:50:16 pppd[198]: Modem hangup, connected for 1 minutes
Apr 3 23:50:16 pppd[198]: Connection terminated, connected for 1 minutes

这是怎么回事