While developing the IPv6 protocol, the IETF (Internet Engineering Task Force) also designed and released specifications for a security architecture termed IPsec (IP Security). This architecture is a mandatory component of the IPv6 specification, which attempts to address the essential security needs of future network infrastructures. However, since IPv4 is currently the most widely deployed and mainstream protocol for today’s networks, IPsec specifications for IPv4 have also been released to meet the ever-increasing security requirements.

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