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Local Destination Port Filtering
The destination port in incoming packets identifies the service or client connection the packet is intended for.
Client requests will set the destination port to the service number assigned to the particular service.
Responses from remote servers will usually have a destination port in the unprivileged range between 1024 and 65535.
Protecting non-secure Local Services
Notes:
The destination port in incoming packets identifies the program or service on your computer that the packet is intended for. Incoming requests and connections from remote clients to your local servers will set the destination port to the service number assigned to the particular service. An incoming packet destined for your local web server will have the destination port set to 80, the http service port number.
Incoming responses from remote servers that you contacted will have a destination port in the unprivileged range. If you connect to a remote web site, all incoming messages from the remote server will have a destination port between 1024 and 65535.