Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# limit

Set the sizes of memory pools

    $ sudo pfctl -sm
    states        hard limit    10000
    src-nodes     hard limit    10000
    frags         hard limit     5000
    tables        hard limit     1000
    table-entries hard limit   200000

You can adjust those in `pf.conf`,

    set limit states 25000
    set limit table-entries 300000

or

    set limit { states 25000, src-nodes 25000, table-entries 300000 }

Note: limited by available kernel memory