Independent Verification of IPsec Functionality in FreeBSD
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# 5 IPsec---Definition

Internet Protocol security extensions to IPv4; required for IPv6. A protocol for negotiating encryption and authentication at the IP (host-to-host) level. SSL secures only one application socket; SSH secures only a login; PGP secures only a specified file or message. IPsec encrypts everything between two hosts.

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Caveat |  | Installing IPsec