# Drop Multicast Traffic

**URL:** https://community.cambiumnetworks.com/t/drop-multicast-traffic/60562
**Category:** Enterprise Wi-Fi Networks
**Created:** [March 3, 2019, 8:50pm UTC](https://community.cambiumnetworks.com/t/drop-multicast-traffic/60562 "2019-03-03T20:50:19Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![nbctcp](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/n/c5a1d2/32.png) [@nbctcp](https://community.cambiumnetworks.com/u/nbctcp)
#### Post date: [March 3, 2019, 8:50pm UTC](https://community.cambiumnetworks.com/t/drop-multicast-traffic/60562/1 "2019-03-03T20:50:19Z")

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![dropmulticast.png](https://d1okf4ta8xniw3.cloudfront.net/original/2X/7/787ee72132da4bdc118f4f0ea0595b56ce703c4a.png "dropmulticast.png")

NOTE:  
-1 minor typo there  
Drop the send/receive of multicat traffic

should be

Drop the send/receive of multicast traffic

Hope fixed in the next firmware

I have vlan10 and vlan20

I want to simulate "Drop Multicast Traffic"

What has been tested by set&nbsp;"Drop Multicast Traffic" in vlan20 SSID:

1. put vlc streaming in vlan1 and put vlc player in vlan20 SSID

RESULT: can't block

2. pc in vlan20 play Youtube

RESULT: can't block

QUESTIONS:

1. What software I need to simulate&nbsp;"Drop Multicast Traffic"

tq

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### Author: ![deltabravo19](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/d/779978/32.png) [@deltabravo19](https://community.cambiumnetworks.com/u/deltabravo19)
#### Post date: [March 13, 2019, 11:44pm UTC](https://community.cambiumnetworks.com/t/drop-multicast-traffic/60562/2 "2019-03-13T23:44:26Z")

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Good eye on that typo. What exactly are you looking for? A way to generate multicast traffic? If you have an extra VoIP phone handy you could provision it to do a multicast page.  
  
Things like chromecasts generate multicast traffic.

To sniff out multicast traffic on your network you should use this filter in wireshark:

ip.dst==224.0.0.0/4

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### Author: ![CAM\_TSK](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/c/5f8ce5/32.png) [@CAM\_TSK](https://community.cambiumnetworks.com/u/CAM_TSK)
#### Post date: [March 14, 2019, 4:41am UTC](https://community.cambiumnetworks.com/t/drop-multicast-traffic/60562/3 "2019-03-14T04:41:26Z")

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nbctcp,

- You can use "IPERF" to generate multicast traffic.

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<div class="post-metadata">

### Author: ![nbctcp](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/n/c5a1d2/32.png) [@nbctcp](https://community.cambiumnetworks.com/u/nbctcp)
#### Post date: [March 21, 2019, 5:18am UTC](https://community.cambiumnetworks.com/t/drop-multicast-traffic/60562/4 "2019-03-21T05:18:30Z")

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@CAM\_TSK

Could you please elaborate.

1. what version you use. I heard must use iperf2 instead of iperf3, because iperf2 support multicast

2. If I use iperf2 for windows, I need to use binary without cygwin.

What is in your site

3. can I test running iperf2 within same windows pc. i.e I open 2x cmd

Server side: iperf.exe -s -B 224.0.0.1 -i 10

Client side: iperf.exe -c 224.0.0.1 -u -b 80k –i 10 –t 92

Those just to test whether syntax is correct and test whether there is connection between server and client within same host

tq