Which statements are correct regarding an IPv6 over IPv4 IPsec configuration?

The correctness of the statement regarding the destination quick mode selector being an IPv6 address stems from the nature of IPv6 over IPv4 IPsec configurations. In such a setup, the encapsulation of IPv6 traffic within an IPv4 framework leads to specific requirements about the addressing in the IPsec settings. The destination quick mode selector specifies the endpoint of the IPsec tunnel; thus, it must be configured for the actual protocol being tunneled—in this case, IPv6.

When an IPv6 packet needs to be transmitted over an IPv4 network using IPsec, the destination must be defined appropriately in terms of its addressing scheme (IPv6). This means that while the underlying transport mechanism might be IPv4, the actual data (i.e., what’s being secured and delivered) is IPv6, which mandates that the destination address within the scope of IPsec must reflect that by being an IPv6 address.

On the other hand, options containing IPv4 addresses for the source quick mode selector or local gateway IP in this specific context do not hold as they misinterpret how IPsec encapsulation works in a dual-stack environment. The local and remote gateway requirements vary depending on the nature of the private networking involved and the encapsulation process being utilized.