PF to Preventing SMTP Brute Force Attacks

Hi FreeBSD Gurus,


i want to use PF to Preventing SMTP Brute Force Attacks. i need some help
to understand correct syntax.

URL Explaining this: http://www.openbsd.org/faq/pf/filter.html#stateopts


i expect the following behavior from the PF rule below:

Limit the absolute maximum number of states that this rule can create to 200

Enable source tracking; limit state creation based on states created by
this rule only

Limit the maximum number of nodes that can simultaneously create state to 100

Limit the maximum number of simultaneous states per source IP to 3

Solution:
int0="em0"
trusted_tcp_ports="{22,25,443,465}"

pass in on $int0 proto tcp from any to any port $trusted_tcp_ports keep
state max 200, source-track rule, max-src-nodes 100, max-src-states 3

please help ..

Thanks / Regards


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