A while back, Windows had many services listed for network connections and a firewall was an integral part of their systems back then. There is a need for blocking incoming connections only if there are applications listening for these connections. Also, Leopard firewalls only block incoming connections, ipfw is available on OS X 10.5 though it is disabled by default which can be enabled using steps given in a later section. Socket filters cannot be told to block allowed connections from unsecure networks. Pocket filters are more flexible than socket filters. In later versions (Leopards) to ipfw, they add a new Socket-Filtering firewall (Application Firewall) these firewalls block or allows connections based on which application is requesting network connection. For example, packet-filtering firewalls allow incoming connections from your work network but not first-time networks. They distinguish incoming connections by type, using port numbers and by origin and destination, using IP addresses. Packet Filtering Firewalls or ipfw checks each packet passing through your Mac’s network and controls its movements based on a predetermined list of rules. Versions of OS X through 10.4 (Tigers) has a firewall called ipfw.
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