a new question on iptables and port 5353

[Paul Allen Newell]

To all:

With help from Craig and Reindl, I've understood what happens with the 
automated entry of port 631 for udp/tcp and how to rewrite to not make 
it a world access (in/out) rule. Waiting for next install of F16 to test 
when and how the automated entry happens.

I saw this entry in iptables but decided to wait on asking about it 
until I understood port 631:
+++
-A INPUT -m state --state NEW -m udp -p udp --dport 5353 -d 224.0.0.251 
-j ACCEPT
+++

I know I didn't add it. From what I can tell, port 224.0.0.251 has to do 
with "multicast DNS". Everything I see about port 5353 involves Macs.

My gut says that, since I have no Macs, this must be something that got 
added when I installed my printer and that CUPS/whatever did a blanket 
automated entry to cover any issues if I had a Mac on my net.

Can anyone tell me if I am right (or, if not, what it really is). I feel 
I should be able to blast it from iptables without having any problems, 
but want some better minds to comment first.

Thanks,
Paul