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IPSec is most commonly used to secure VPN traffic. Where else is this protocol suite used? What else can it be used for?

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This is quite a broad question so it would be good if you could narrow down what you want to know exactly. –  NULLZ May 30 '13 at 6:06
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closed as not a real question by NULLZ, Adnan, Rory Alsop May 30 '13 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.

Internet Protocol Security (IPsec) was originally developed for IPv6, but found widespread deployment first in IPv4, for which it was re-engineered. IPsec was a mandatory specification of the base IPv6 protocol suite,[3][21] but has since been made optional.[22]

Source: Wikipedia

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