The Point to Point Tunneling Protocol (PPTP) can be used to create Virtual Private Networks -- networks that appear to the participants to be small and private using public networks to provide much or all of the infrastructure. PPTP can be used to tunnel IPX (Novell), NETBEUI (Microsoft) or IP packets over IP networks. Tunneling of IP within IP packets is often required when a local network uses IP addresses internally that might not be compatible with external IP numbers.
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