Techopedia Explains Port-to-Application MappingInformation in a PAM table serves as a default mapping for traffic passing through firewalls. These tables are capable of identifying applications associated with port numbers, including services running on non-standard ports. The mapping information provided by entries in the PAM table includes system-defined port mapping, user-defined port mapping and host-specific port mapping.
By using host-specific port mapping, users can use the same port number for different services on different hosts. For example, it is possible to map port 8000 with Hypertext Transfer Protocol (HTTP) services for one host and map the same port with the telnet service for another host. These mappings permit the users to apply PAM to specific subnets when they run services using port numbers different from those specified in the default mapping information.
The ip port-map configuration command is used in establishing the port-to-application mapping. The no form of this command deletes the user-defined PAM entries.
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