428 CHAPTER 15 Securing RPC Traffic
7. Check the box listed for requests from the External network and click Next to
continue.
8. Click Finish, Apply, and OK to save the rule.
Defining a Custom Publishing Rule
A good deal of customization can be done on individual server publishing rules and on
individual protocols. This enables custom publishing rule scenarios to be implemented
and custom protocols to be established. For example, clicking on the Ports button on the
Select Protocol dialog box from the server publishing step-by-step provided earlier brings
up the dialog box shown in Figure 15.12.
This dialog box allows for customization of the port the service will use, which can be
useful when publishing a known service on a different port. For example, some organizations
may want their users to connect to a standard FTP port (port 21) when connecting
to a server on the Internet, but to have that server itself actually use a different port such
as 2021, for security reasons. Creating an FTP server publishing rule and then modifying
these port settings allows for this type of functionality.
In addition, custom protocols can be created for use in server publishing rules.
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