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The successful establishment of a PPP link requires that the endpoint configuration of each host wishing to establish the link is compatible with the other. PPP operation includes parameter negotiation that is helpful in achieving this compatibility. PPP negotiation, however, is not always successful in mediating between the two hosts wishing to establish a connection. This most often occurs when trying to connect two hosts running PPP from different vendors. The section ``Troubleshooting PPP'' is provided to help you resolve compatibility problems.
Another way to avoid compatibility problems is to know in advance what parameter settings on each side are required to achieve compatibility. There are a number of PPP vendors and each has a number of versions of their software in the field. The following sections describe required parameters for compatibility with earlier versions of SCO PPP and compatibility with a few PPP versions from other vendors: