Wireshark-users: Re: [Wireshark-users] Is this normal?
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From: Stephen Fisher <steve@xxxxxxxxxxxxxxxxxx>
Date: Tue, 31 Mar 2009 13:16:34 -0600
On Tue, Mar 31, 2009 at 12:59:26PM -0400, Peter Hartmann wrote:

> I also see quite a bit of this kind of thing.  From what I understand, 
> this address 239.255.1.1 falls in a range dedicated to multicast.  
> I'm also wondering if the spanning tree packets mean that there is a 
> cable plugged in to a switch twice.  Could that be?
> 
> 54 7.619442 10.3.85.127 239.255.1.1 UDP Source port: dnox Destination 
> port: dnox

Yes, this is a muliticast in the range that is "locally administered."  
Maybe this is an audio and/or video broadcast that just happens to use 
port 4022 (dnox)?

> 57 8.000269 Netgear_de:9b:97 Spanning-tree-(for-bridges)_00 STP Conf. 
> Root = 32768/00:0f:b5:de:9b:97 Cost = 0 Port = 0x8001

This is not indicative of anything out of the ordinary.


Steve