Some pretty common misconceptions here:
#1: The size of your port doesn't matter. What matters is your hardware. If your hardware can't handle the attack, then you're likely going to be in big trouble when that real attack comes in. The size of the port is rather minimal when hardware comes into consideration.
#2: CSF is not a firewall. It is a frontend to IPtables
#3: Hardware firewalls will always be important , way more so than software (IE: CSF). These are somewhat more complicated, however, which is why companies charge big $$$ for software firewall frontends.
Tom Whiting, WHMCS Guru
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