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5. The Port Number

5.1 Traditional Port Resolution​

Currently, the translation from service name to port number happens at the client, often using a file such as /etc/services.

5.2 Advantages of Moving Port Information to DNS​

Moving this information to the DNS:

  1. Reduces Update Burden

    • Makes it less necessary to update these files on every single computer of the net every time a new service is added

  2. Enables Non-Privileged Ports

    • Makes it possible to move standard services out of the "root-only" port range on unix
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