http://packetlife.net/blog/2008/sep/3/ospfv3-authentication/
Most IPv4 routing protocols support some form of neighbor authentication, provided by either a plaintext password or MD5 HMAC. However, OSPFv3 (OSPF for IPv6) doesn't include any authentication capabilities of its own; instead, it relies entirely on IPsec to secure communications between neighbors. This is beneficial in simplifying the OSPFv3 protocol and standardizing its authentication mechanism.
Most IPv4 routing protocols support some form of neighbor authentication, provided by either a plaintext password or MD5 HMAC. However, OSPFv3 (OSPF for IPv6) doesn't include any authentication capabilities of its own; instead, it relies entirely on IPsec to secure communications between neighbors. This is beneficial in simplifying the OSPFv3 protocol and standardizing its authentication mechanism.
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