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RFC Tidbit: IPv6 Flow Label

Finally someone decided to make IPv6 flow label useful. First they had to justify why they want to change it, and then modify the definition (way too much work for a field nobody ever used). Planned use is to enhance ECMP load balancing, both in native IPv6 environments (where using the flow label is faster than digging deep into variable-length IPv6 extension headers) and (even more importantly) in tunneled environments, where the flow label propagates the entropy from the tunnel payload into the envelope header.

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