Port-to-application mapping (PAM) enables you to customize TCP or UDP port numbers for network services or applications. PAM uses this information to support network environments that run services using ports that differ from the registered or well-known ports associated with an application, such as those identified later in this chapter.
PAM enables CBAC-supported applications to be run on nonstandard ports. Using PAM, network administrators can customize access control for specific applications and services to meet the distinct needs of their networks.
PAM also supports host- or subnet-specific port mapping, which enables you to apply PAM to a single host or subnet using standard ACLs. Host- or subnet-specific port mapping is done using standard IP ACLs. The PAM table provides three types of mapping information, each of which is discussed in more detail in the following sections:
• System-defined port mapping
• User-defined port mapping
• Host-specific port mapping
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