Book recommendation Please....VPN Network maintenance

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http://www.linuxquestions.org – Hello Everyone, I work for a small retail company which until recently consisted of just one location. This month, we will open two new stores. I have been given the task of setting up a VPN network between the three locations and maintaining it. This network will consist of a main data server on the original location which has four client computers. The second location (another part of town) will have three clients, and the third location will have one client, all connected to the main data server (Retail POS system.) This will be a hardware VPN, with the main data server and all of the (HowTos)