... value.¹

Clearly, this is dangerous unless there is no possibility of the packet looping around to the normalizer again.

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... one²

More generally, advances the ID field in a predictable fashion.

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... state.³

Of course we do not send a keep-alive to make the second RST reliable or we'd initiate a RST war.

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... dataless⁴

In practice, one sends the last acknowledged byte if possible, for interoperability with older TCP implementations.

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... fields.⁵

At the time of writing, ICMP support is still incomplete.

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... traffic⁶

Normally fewer checks would be enabled for outbound traffic.

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