Wireshark, Ubuntu, and mystery UDP packets

[Stéphane Charette <stephanecharette () gmail com>]

When I start Wireshark, all is fine.  But when I start capturing, this
creates a steady stream of UDP packets.  As soon as I stop the capture, the
stream stops.  I've never noticed this before.

The UDP stream is one directional, going to multicast address 232.9.3.115,
port 6288.  Each packet is 1328 or 1332 bytes of binary payload.  The
packets are sent at a steady rate of 5.3Mbps.  The following options are
*disabled* in wireshark:

   - resolve mac address
   - resolve network names
   - resolve transport names
   - promiscuous mode


This is my normal local desktop, running 16.04, kernel 4.4.0.22-generic.
Local, not a remote desktop.  Wireshark is installed from the normal Ubuntu
repo:

> dpkg -l | egrep "wireshark|pcap" | grep -v "rc  "
ii  libpcap0.8:amd64       1.7.4-2             amd64    system interface
for user-level packet capture
ii  libwireshark-data      2.0.2+ga16e22e-1    all      network packet
dissection library -- data files
ii  libwireshark6:amd64    2.0.2+ga16e22e-1    amd64    network packet
dissection library -- shared library
ii  wireshark              2.0.2+ga16e22e-1    amd64    network traffic
analyzer - meta-package
ii  wireshark-common       2.0.2+ga16e22e-1    amd64    network traffic
analyzer - common files
ii  wireshark-qt           2.0.2+ga16e22e-1    amd64    network traffic
analyzer - Qt version

I'm at a complete loss as to why starting a packet capture on my local
desktop is causing this mystery stream of UDP packets.  I'm hoping someone
can tell me either why, how to stop this, or can confirm the same strange
behaviour.

Stéphane

___________________________________________________________________________
Sent via:    Wireshark-users mailing list <wireshark-users () wireshark org>
Archives:    https://www.wireshark.org/lists/wireshark-users
Unsubscribe: https://wireshark.org/mailman/options/wireshark-users
             mailto:wireshark-users-request () wireshark org?subject=unsubscribe