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. I have not been able to find away to
cleanly disable this. On a home system why would I want my house
systems to be chatting with the ISP's DNS servers?
In many fed. environments we don't like systems that chat a lot and
advertise their presence to everyone especially outside our local
subnet, i.e. the local subnet means we have a netmask of
255.255.254.0 covering one or two buildings and our DNS servers are
outside that range.
** If our networking people were to directly block this traffic like
they do 135-139 then OS X would throw continual errors.
On Mar 15, 2007, at 8:54 AM, Michael wrote:
Why does OS X continually chat with your DNS server via port 5353?
I have verified that this is not DNS lookups, i.e. I lose no
functionally when I block this traffic; however, depending on how
this traffic is blocked my logs fill up with different types of
I gather OS X is trying to advertise to the DNS server what
services it offers. This is something that should be possible to
turn off without creating megabytes of logs.
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