Worht Reading: Misusing the IPv6 flow label

Flow state as a forwarding optimization remained exclusively in choke-points where flow-state-tracking was an actual necessity by design such as firewalls and Network Address Translation/Port Address Translation. Modern routers are bounded in performance by the worst-case scenario for forwarding costs, namely that the next-hop for all packets forwarded must be looked up on a per-packet basis. —APNIC

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