BB wrote:
If a host is sending packets on ports that aren't even open can it temporarily close all connections to this host.

I don't think this a task pf itself should do but you can implement something to monitor connections attemps on closed ports and then inspect the pf's state table (pfctl -s state) and remove it (pfctl -k).

Do you want something like PortSentry ? Someone could spoof those attempts and create a DoS on something you don't want to block.

--
Giovanni P. Tirloni

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