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I have several back end servers that are IPv6 only. Since they are just used by our front-end servers it doesn't matter that much.

It is nice to see 0 random port scans and SSH brute-force attacks. IPv6 space is so big it helps give some security through obscurity.

Eventually people might be able to infer things that help them reduce the space to scan a lot: https://arxiv.org/abs/1606.04327

(may not apply to every allocation strategy)

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