Steven Stern wrote:
5353 is used by Windows dynamic DNS. If you're not supporting dynamic DNS on your local network, you can continue to drop/ignore the packets. They're needed only by a DNS/DHCP server.
I don't think so.
Google combinations of "udp port 5353" "zeroconf rfc" "zeroconf" "bonjour" and "rendezvous."
I have it open, but then I see the occasional Mac. I don't think Linux (yet) actively uses it; Windows XP does not, unless one downloads some software from Apple.
I think Windows addresses the same sorts of problems with uPnP.