Why are these ports open in iptables on new FC4 install?

[Tim Waugh]

On Sat, Feb 11, 2006 at 06:58:07PM -0500, Scot L. Harris wrote:

> I'm also wondering about port 631 being open by default.  I know this is
> used for ipp printing but I have not setup this machine to provide print
> services yet.

This is to allow your CUPS daemon to collect information about which
remote queues are available, so that when you want to print you can
select a network queue to print to.

Only the UDP port is open, which is used for remote print servers to
broadcast to for advertising their services.

The TCP port (for configuring your CUPS daemon) remains closed unless
you've opened it -- and even then, CUPS is configured not to allow
remote configuration by default.

So, in short, having UDP port 631 open means that printing to
network print servers can "just work" for you.

Tim.
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