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Troubleshooting PPP links

Connect to the remote side using cu

Check that the system is configured for dial-in connections

Examine PPP negotiation in the log file
    Link initiation
    Negotiate LCP parameters
    Perform PAP or CHAP authentication
        Secret not found in the authentication database
        Local host fails to be authenticated by remote host using PAP
        Local host fails to authenticate remote host using PAP
        Local host fails to be authenticated by remote host using CHAP
        Local host fails to authenticate remote host using CHAP
    Negotiate IPCP and other parameters
    Link termination

Check that the PPP interface exists

Try to ping the remote side

Check that routing is set up correctly

Interoperating with PPP in Microsoft Windows
    Authentication
    TCP/IP parameters

Interoperating with 3Com NetBuilder