IPSec is most commonly used to secure VPN traffic. Where else is this protocol suite used? What else can it be used for?
closed as not a real question by D3C4FF, Adnan, Rory Alsop♦ May 30 at 6:46
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Well actually, it was primarily developed for IPv6 traffic. It doesn't have to be used for VPN's per say, but it is designed to be an end-to-end security scheme and can be used to secure communications for any application traffic across an IP network.