IPsec (IP Security Protocol): "IPSec defines encryption, authentication and key management routines for ensuring the privacy, integrity and authenticity of data in a VPN as the information traverses public IP networks.
Because IPSec requires each end of the tunnel to have a unique address, special care must be taken when implementing IPSec VPNs in environments using private IP addressing based on network address translation. Fortunately, several vendors offer solutions to this problem. However, they add more management complexity."
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