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Adjust Your Firewall

Every computer on the Internet has its own unique address—an IP address. You may access a Web site using its domain name (such as www.filemaker.com), but in fact, Internet routing tables convert every domain name into an IP address (such as 216.168.46.10).

Because a computer connected to the Internet may be running a number of services (mail, Web, FTP, and more), it is necessary to have a mechanism to address requests to specific services. Ports are used for this purpose. Thus, a request for a Web page is sent to port 80—http://216.168.46.10). You can explicitly direct a request to a specific port—http://216.168.46.10:10, but the standard requests are automatically sent to the appropriate ports.


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