Layer 2 Tunneling Protocol (L2TP)
L2TP was first introduced in traditional dialup models, specifically to offer VPN services. Traditional dialup networking services support only registered IP addresses, which limits the types of applications that are implemented over VPNs. L2TP supports multiple protocols and unregistered and privately administered IP addresses over the Internet. This allows the existing access infrastructure, such as the Internet, modems, access servers, and ISDN terminal adapters (TAs), to be used. It also allows enterprise customers to outsource dialout support, thereby reducing overhead for hardware maintenance costs and 800 number fees, and allows them to concentrate on corporate gateway resources.
L2TP, an extension to ...
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