... and telecommuters to connect to their corporate intranets or extranets. VPNs are cost-effective because users can connect to the Internet locally and tunnel back to connect to corporate resources. This not only reduces overhead costs associated with traditional remote access methods, but also improves flexibility and scalability. Traditional dial-up networking services only support 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 dial out support, thus reducing overhead for hardware maintenance costs and 800 number fees, and allows them to concentrate corporate gateway resources. IPSec IPSec VPN is an Enterprise Network deployed on a shared infrastructure using IPSec encryption technology. IPSec VPNs are used as ...

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