there is an even better security system then firewalls- turn you computer off at least once a day!!! resets your dns number. <<<< Not true. Different connection types get IP addresses in different ways. If you are on a dialup with an ISP like AOL then simply disconnecting and reconnecting will probably give you a new IP address. If you are on DSL or cable then turning off the computer does nothing. The IP is assigned to the modem. In some cases resetting the modem might change your IP, but in many cases it does not. Cable tends to use assigned IPs, but resetting the modem often results in the same IP coming right back. Some DSL connections have a fixed IP, so nothing you do short of contacting the ISP will change it. But none of that really matters except to slow somebody that is targeting you personally. The block scan attacks happen to blocks of IP addresses, so 1 second after you have a new IP address you are just as vulnerable to being attacked. A firewall is a blockade. Changing your IP does little or nothing to stop attacks.