open up firewall from "anywhere" to postgres ports?

Hi,

I have a very basic issue that i'd like to discuss
I have just recieved a newly installed database server.
I'm wondering if i should open up the ports to my two clusters 5432
and 5433 from "Anywhere"?
As an alternative, i could add each ip address both in the firewall
and the pg_hba.conf.

I feel that it's a stupid question, since there is pg_hba, which
already does this work.
Yet all the people that i know, do it in the firewall AND the pg_hba.conf.

Is there any potential danger in opening up the firewall for those ports??

cheers,

WBL

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