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pfck - pf check - organizes flow information by host
pfck is a perl script that reads the state table of pf and reports back flows based on a supplied port number. pfck is very handy in ddos attacks to identify who's hitting a host or network on a particular port service, and who they are specifically hitting.
Bruteblock allows system administrators to block various bruteforce attacks on UNIX services. The program analyzes system logs and adds attacker's IP into IPFW table effectively blocking them. Addresses are removed from the table after expiration period
This Daemon written in Perl, logs FreeBSD ipfw ip accounting counters every X seconds/minutes, so after rebooting, crashing, flushing, zero out your ipfirewall table, you don't loose any mayor traffic information.