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
We have observed some clients with extremely large lists of IPv6 endpoints, in some cases from subnets where the machine also has the zero address for a whole /48 with then arbitrary addresses additionally assigned within that /48. It is in general unnecessary for reachability to report all of these addresses, typically only one will be necessary for reachability. We report two, to cover some other common cases such as some styles of IPv6 private address rotations. Updates tailscale/corp#25850 Signed-off-by: James Tucker <james@tailscale.com>