VPN Topologies
All VPNs have a few basic components in common:
A private network— The network is often a Class C subnet managed by a router, or it’s a block of IP addresses translated by a NAT firewall into as large an internal virtual network as is necessary.
A VPN server— The server sits just inside the router or is incorporated as part of the router itself, as in the case of many modern routers from Cisco and other manufacturers, or a FreeBSD machine acting as a router.
A client— The client is somewhere out on the Internet.
The details of these configurations, however, can vary quite a lot.
Figure 31.3 shows the kind of topology likely to be used by employees on the road. A single machine uses a standard dial-up ISP (such as found in a hotel ...
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