I am on Ubuntu 14.04.5 platform. I came across the same bug yesterday
while trying to set up pulseaudio server on Windows to send audio from
my Ubuntu laptop in local network and it rendered the home network
unusable. It costed me hours to locate the pest. Dos attack triggered by
pavucontrol, when I close it flooding diminishes.

I implemented the following workaround `pactl unload-module module-rtp-
send`

Nobody's  patched it for 8 years, so we have to live with this bug and
no RTP server until my learning curve reaches a higher level to overcome
it.

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https://bugs.launchpad.net/bugs/411688

Title:
  pulseaudio floods network with multicast packets

Status in PulseAudio:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed
Status in pulseaudio package in Debian:
  Fix Released

Bug description:
  Binary package hint: pulseaudio

  Since a karmic update last week, when pulseaudio is running it floods
  the network with multicast packets, to the point where the wireless
  interface I'm using is so flooded that no other network traffic can be
  transfered.

  Here is a snippet of tcpdump -i wlan 0 -n:
  ---8<---
  01:10:36.532748 IP (tos 0x10, ttl 1, id 23823, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d0f 4000 0111 2d6d 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 f9f6 800a ee8e
        0x0020:  0071 a980 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.539999 IP (tos 0x10, ttl 1, id 23824, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d10 4000 0111 2d6c 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 f8b5 800a ee8f
        0x0020:  0071 aac0 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.547289 IP (tos 0x10, ttl 1, id 23825, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d11 4000 0111 2d6b 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 f774 800a ee90
        0x0020:  0071 ac00 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.556725 IP (tos 0x10, ttl 1, id 23826, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d12 4000 0111 2d6a 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 f633 800a ee91
        0x0020:  0071 ad40 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.561680 IP (tos 0x10, ttl 1, id 23827, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d13 4000 0111 2d69 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 f4f2 800a ee92
        0x0020:  0071 ae80 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.568984 IP (tos 0x10, ttl 1, id 23828, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d14 4000 0111 2d68 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 f3b1 800a ee93
        0x0020:  0071 afc0 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.576212 IP (tos 0x10, ttl 1, id 23829, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d15 4000 0111 2d67 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 f270 800a ee94
        0x0020:  0071 b100 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.588095 IP (tos 0x10, ttl 1, id 23830, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d16 4000 0111 2d66 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 f12f 800a ee95
        0x0020:  0071 b240 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.590645 IP (tos 0x10, ttl 1, id 23831, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d17 4000 0111 2d65 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 efee 800a ee96
        0x0020:  0071 b380 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.605081 IP (tos 0x10, ttl 1, id 23832, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d18 4000 0111 2d64 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 eead 800a ee97
        0x0020:  0071 b4c0 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.612355 IP (tos 0x10, ttl 1, id 23833, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d19 4000 0111 2d63 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 ed6c 800a ee98
        0x0020:  0071 b600 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.619789 IP (tos 0x10, ttl 1, id 23834, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d1a 4000 0111 2d62 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 ec2b 800a ee99
        0x0020:  0071 b740 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.627001 IP (tos 0x10, ttl 1, id 23835, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d1b 4000 0111 2d61 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 eaea 800a ee9a
        0x0020:  0071 b880 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.634033 IP (tos 0x10, ttl 1, id 23836, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d1c 4000 0111 2d60 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 e9a9 800a ee9b
        0x0020:  0071 b9c0 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.643178 IP (tos 0x10, ttl 1, id 23837, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d1d 4000 0111 2d5f 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 e868 800a ee9c
        0x0020:  0071 bb00 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.648509 IP (tos 0x10, ttl 1, id 23838, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d1e 4000 0111 2d5e 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 e727 800a ee9d
        0x0020:  0071 bc40 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.655723 IP (tos 0x10, ttl 1, id 23839, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d1f 4000 0111 2d5d 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 e5e6 800a ee9e
        0x0020:  0071 bd80 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.662926 IP (tos 0x10, ttl 1, id 23840, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d20 4000 0111 2d5c 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 e4a5 800a ee9f
        0x0020:  0071 bec0 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.670210 IP (tos 0x10, ttl 1, id 23841, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d21 4000 0111 2d5b 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 e364 800a eea0
        0x0020:  0071 c000 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.679610 IP (tos 0x10, ttl 1, id 23842, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d22 4000 0111 2d5a 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 e223 800a eea1
        0x0020:  0071 c140 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  01:10:36.684789 IP (tos 0x10, ttl 1, id 23843, offset 0, flags [DF], proto 
UDP (17), length 1320)
      10.0.0.1.45232 > 224.0.0.56.46812: UDP, length 1292
        0x0000:  4510 0528 5d23 4000 0111 2d59 0a00 0001
        0x0010:  e000 0038 b0b0 b6dc 0514 e0e2 800a eea2
        0x0020:  0071 c280 ed51 a42b 0000 0000 0000 0000
        0x0030:  0000 0000 0000 0000 0000 0000 0000 0000
        0x0040:  0000 0000 0000 0000 0000 0000
  ---8<---

  As can be seen, these packets are sent several hundreds times a second
  and this completely overloads the network interface.

  Apparently I have pulseaudio set with network access enabled, but I
  can't disable it as the pulseaudio configuration is completely
  disabled (see screenshot).

  As pulseaudio keeps recovering itself the only way I can get any work
  done at the moment is to run "while true; do killall pulseaudio; sleep
  1; done" whenever I want to do anything on the network.

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