Quoting Federico Sevilla III ([EMAIL PROTECTED]):

> Being someone who has a deny-by-default-accept-selectively set of
> IPTables rules for my external interface, I wonder: would you have any
> documents to recommend so I can learn about which of these high-numbered
> ports I need enabled so that "normal operations" work?

Here's one text you can read that covers this topic:  Firewalls and
Internet Security, William R. Cheswick and Steven M.  Bellovin, Addison
Wesley, ISBN 0-201-6335754.  

I happened to run into Bellovin at last week's USENIX Security Conference,
and thanked him for that text.  He reminded me that the second edition
is due out soon.

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