VPN Implementations
Throughout the chapter up to this point, I have repeatedly referred to “VPN implementations,” but haven’t defined what a VPN implementation actually is. First, let me discuss what a VPN is and what it can encompass. Specifically, the following sections will discuss these popular VPN implementation methods, including how they are implemented, and their basic advantages and disadvantages:
GRE
IPsec
PPTP
L2TP
MPLS
SSL
Other chapters in the book will expand on many of these VPN implementations, so the material you see in the following sections is a basic overview.
GRE
Generic Route Encapsulation (GRE) is a VPN technology originally developed by Cisco and later written up under two Internet Engineering Task Force (IETF) RFCs—1701 ...
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