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

[Tim]

Scot L. Harris:
>> I'm also wondering about port 631 being open by default.


Tim Waugh:
> 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.

I don't have a default set-up machine to look at, but surely this
shouldn't be open to all, just the LAN.  What is the default setting in
that regard?

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