[CONFIG] Block port when listening socket is closed?

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Hi

Would you happen to know a way to control system behaviour when
connection requests are received on TCP or UDP ports where there is no
socket listening? I know this can be done using net.inet.tcp.blackhole
or net.inet.udp.blackhole in FreeBSD but I'm not aware of anything
similar in Linux, so I thought iptables would be the only possibility.
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