Re: [Fed-Talk] OS X chatting with DNS server via port 5353
Re: [Fed-Talk] OS X chatting with DNS server via port 5353
- Subject: Re: [Fed-Talk] OS X chatting with DNS server via port 5353
- From: Scott Cote <email@hidden>
- Date: Thu, 22 Mar 2007 22:18:56 -0700
Looks like the it may be iTunes trying to find iTVs:
"UDP port 5353 is used by Apple TV for automatically finding
computers with iTunes on your network using Bonjour."
http://docs.info.apple.com/article.html?artnum=305115
Full article copied here:
Networked devices, like your Mac, PC, or Apple TV, communicate with
each other using specific communication channels known as TCP and UDP
ports. For example, your Internet web browser commonly communicates
with the Internet using port 80.
Four network ports are used by Apple TV for communications on your
network.
TCP port 3689 is used to communicate with iTunes while using the
iTunes Library Sharing feature.
UDP port 5353 is used by Apple TV for automatically finding computers
with iTunes on your network using Bonjour.
TCP port 80 and 443 are used for basic and secure communications with
the iTunes Store via the Internet.
These are well known ports used by other Apple products, like iTunes.
If you can use all the features of iTunes, these ports are likely
already open on your firewall or NAT router.
For a complete list of network ports used by Apple products, see
"Well-Known" TCP and UDP ports used by Apple software products.
Sincerely,
Scott
On Mar 19, 2007, at 5:47 AM, Fairbanks, Lee (contr-ird) wrote:
If I remember correctly - when dealing with a similar problem I
ended up
having to disable the mDNSresponder daemon to get it to stop
chattering.
That will nuke all Bonjour/Rendesvous/Zeroconf connectivity though. I
really don't understand why there isn't an option to turn this traffic
off via the GUI.
-----Original Message-----
From: fed-talk-bounces+lee.fairbanks.ctr=email@hidden
[mailto:fed-talk-bounces
+lee.fairbanks.ctr=email@hidden] On
Behalf Of Timothy J. Miller
Sent: Thursday, March 15, 2007 4:01 PM
To: Michael
Cc: email@hidden
Subject: Re: [Fed-Talk] OS X chatting with DNS server via port 5353
Michael wrote:
Yes, I use another program but this issue I'm looking at is not
straight
Bonjour, it's using port 5353 to send something to the DNS servers
not
broadcast addresses.
Send me a pcap (be sure to set the snaplen to 1500 bytes) and I'll be
happy to take a look at it.
The services advertised only account for about half of the
traffic, if
I
have iTunes configured with sharing off why should it be broadcasting
Bonjour traffic, it does not have any services it's advertising and
it's
not looking for any advertised services.
Bonjour broadcasts on a backoff & retry schedule in order to query
neighbors about new services. When a Bonjour-enabled service comes
online it similarly broadcasts its presence. Both are done because
the
transport is not reliable.
-- Tim
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