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VPNs Illustrated: Tunnels, VPNs, and IPsec Jon C. Snader
Publisher: Addison-Wesley Professional

IPSec has been deployed widely to implement Virtual Private Networks (VPNs) (an example of current VPN technology is described in [11]). Figure 5 below illustrates the tunnel mode format using the ESP header. We have Sophos UTM 9.1 as the "hub" gateway, in responder mode to a couple of site-to-site ipsec tunnels. Snader Language: English Page: 480. OpenVPN is great for connections from To illustrate the setup I want to build I've made this ascii “drawing” – hopy you can understand it Host1 -- LAN1 -- Router1 --[BIG, Luckily we can combine them in a way so the tunnel mode can be on top of transport mode + you can make host to subnet connections, and this is what you're likely to want. VPNs Illustrated: Tunnels, VPNs, and IPsec. ISBN: 032124544X, 9780321245441. VPNs Illustrated: Tunnels, VPNs, and IPsec Jon C. VPNs.Illustrated.Tunnels.VPNs.and.IPsec.pdf. For opensource VPN solutions you have two choices (roughly said) – OpenVPN or IPsec. A VPN is for wrapping raw IP packets into some kind of "tunnel" between two sites (one of the site being possibly reduced to one computer, i.e. Publisher: Addison-Wesley Professional.