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If you need to support printing from one subnet to another,
configuring print capability can be difficult if you use a firewall at the
gateway. If you do use a firewall, opening ports to allow printing across the
gateway can lead to security risks. In addition, enabling users to easily
locate and user printers can be difficult because of name broadcast

A perfect solution to such situations is the Internet
Printing Protocol (IPP), included with Windows 2000 and later. When you install
Internet Information Services (IIS) on Windows 2000 Server, the setup process automatically
adds a virtual directory named Printers to the default Web Site. This virtual
directory points to the physical folder %systemroot%\Web\Printers, which contains
the files necessary to enable users to manage and print to printers hosted by
the server. (In Windows Server 2003, you must add Internet Printing from the
Add Or Remove Programs applet.)

IPP uses port 80, which is open in most firewalls, making it
possible for users to print through IPP across network segments or even across
the Internet. For example, you could use IPP as a no-cost alternative to faxing
between branch offices. Rather than faxing documents, just print them on the
remote office’s printer.

With IIS and the Printers virtual directory installed, you
can add printers to the target server as needed. (Keep in mind that the
printers must be local to the server.) Windows automatically makes the printers
available through IPP when you add the printers.

To use or manage the printers, just connect to http://<server>/Printers,
where <servers> is the IP address or fully qualified domain name of the
server hosting the printers. Use the resulting Web page to manage or connect to
the remote printer.