Chapter 4. PPTP and L2TP
Even though IPsec is very popular in the marketplace as far as VPN implementations go, there are many other VPN implementations to choose from. For example, if you come from a Microsoft shop, you probably will be exposed to Microsoft’s VPN implementations: the Point-to-Point Tunneling Protocol (PPTP) and the Layer-2 Tunneling Protocol (L2TP). Like IPsec, both of these protocols have been standardized by IETF and ratified into RFCs.
PPTP is a simple-to-implement VPN solution defined in IETF’s RFC 2637. It allows for the use of user authentication (before IPsec included this with XAUTH) and the ability to be interoperable with NAT, making it, originally, a preferred remote access solution over IPsec, which lacked these ...
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