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Usually you just change the whitelist setting in the server.properties file. That way a whitelist isn't required and allows anyone on the internet to join the server provided they have a valid minecraft account.
(worth mentioning - version 1.3.0 of Direwolf20 is in beta - so this feature could be disabled in the release version of the pack, or in later versions)
If this is not the question, please give more information (what pack, etc.)