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'''IPsec''' is a method of running an encrypted overlay network, so as to protect traffic originating
from an unencrypted and/or untrusted network, such as a coffee shop's open WAP.It is among a number ofother protocols which can be used. L2TP/IPsec is one of the most common methods, although OpenVPN and IKEv2also are viable, faster, and arguably more secure methods. The latter is supported in openiked developed bythe [[OpenBSD]] project
==Network-to-Network==