Port 5353 is for multicast DNS - which is part of Bonjour.
Yes, I know port 5353 is Bonjour but why does OS X need to chat
with the defined DNS servers as part of Bonjour. It's not looking
up hostnames when it's doing this.
Just a side note on Bonjour/multicast that some might find
interesting/disturbing.
A while ago I added a second ISP and connected a new Linksys BEFSX41
firewall router with NAT and firewall turned on. I have always felt
comfortable with NAT, because any inbound packet not associated with
a known outbound session is by default dropped.
Then, to my surprise, while running iTunes someone else's iTunes
library kept popping up on my list of music sources. It had me a bit
spooked. After spending some time with sniffers and Google, I
discovered iTunes used Bonjour, and by default my Linksys router
allowed multicast traffic into my network!!
So be careful if you are using Linksys, you might be allowing
multicast traffic onto your network, and possibly leaking it out.
Todd
PS. If you are seeing multicast chatter, see if it comes and goes
depending on whether iTunes is on.
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