Automatically generate flow labels based on a flow hash of the packet. This allows intermediate devices, such as routers, to identify packet flows for mechanisms like Equal Cost Multipath Routing (see RFC 6438). 0: automatic flow labels are completely disabled 1: automatic flow labels are enabled by default, they can be disabled on a per socket basis using the IPV6_AUTOFLOWLABEL socket option 2: automatic flow labels are allowed, they may be enabled on a per socket basis using the IPV6_AUTOFLOWLABEL socket option 3: automatic flow labels are enabled and enforced, they cannot be disabled by the socket option Default: 1
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