IPv6 support IPSec

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IPsec is a requirement of the IPv6 specification. IPsec authentication and protection are provided by OSPF for IPv6, and IPv6 IPsec tunnel mode and encapsulation are utilized to safeguard IPv6 unicast and multicast traffic.

IP Security, or IPsec, is a set of open standards established by the Internet Engineering Task Force (IETF) to ensure the security of sensitive data transmitted over unprotected networks like the Internet. IPsec protects and authenticates IP traffic between cooperating IPsec devices peers at the network layer.
Optional network security services provided by IPsec are as follows. In general, the employment of one or more of these services will be dictated by local security policy:

- Data privacy is important.
- Integrity of data
- Authentication of the data source
- Anti-repetition