IPsec VPNs
IPsec is an architecture or framework for security services for IP networks. The name itself is not an acronym, but rather a name derived from the title of the RFC that defines it (RFC 4301, Security Architecture for the Internet Protocol), more generally called IP Security, or IPsec.
IPsec defines how two devices, both connected to the Internet, can achieve the main goals of a VPN as listed at the beginning of this chapter: confidentiality, authentication, data integrity, and anti-replay. IPsec does not define just one way to implement a VPN, instead allowing several different protocol options for each VPN feature. One of IPsec’s strengths is that its role as an architecture allows it to be added to and changed over time as improvements ...
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