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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 ddosattacks to identify who's hitting a host or network on a particular port service, and who they are specifically hitting.
Alfandega is a strong and Modular IpTables Firewall. It provides NAT, port-forwarding, spoofing list, blacklist of crackers and spywares sites, protection for tcp/udp scans, DOS/DDOS and Smurf attacks, TCP tuning, DHCP and PPP support and much more.