VPN Services in FreeBSD: IPSec
VPN services in FreeBSD are conducted using IPSec, or IP Security. The IPSec protocol is routed like IP, but it contains a payload that’s encrypted and authenticated. This payload needs to be decrypted by the machine at the other end using the key exchanged during the tunnel-setup procedure. IPSec is an industry-standard protocol that has been supported in FreeBSD for some time as the result of the work of the KAME project (www.kame.net). It is not built into the default FreeBSD kernel; however, you can enable it easily by building a new kernel.
Tip
The techniques in this chapter describe setting up a VPN using the built-in IPSec functionality in FreeBSD. An alternative VPN infrastructure, using SSL instead of IPSec ...
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