Keep broadcast packets off of Wifi?

[Peter Near]

I'm having some issues with what I think is a misbehaving device. I picked up a Miracast HSV891 HDMI over ethernet transmitter. In theory, it encodes video and then broadcasts it over your IP network to one or many receivers. That actually does work.

However... it is killing my wifi. Wired network seems to work fine but wifi gets so slow it is unusable and clients can't connect. The manufacturer claims it works fine, and returning it to China will cost as much as the device itself. So now I'm trying to troubleshoot and look at workarounds. I am not a networking expert by any means, but I am technical.

I've done some wireshark sniffing from my Mac, and I'm seeing frame checksum and packet length issues on both wired and wireless interfaces coming from that device. Interestingly the broadcast packets are identified on wifi as GVSP and on wired as UDP. I don't know enough about wireshark to know what that means and have asked the question over at the WireShark forum.

Is there any way for me to keep this broadcast traffic off of the wifi segments originating from this one device? I'm running an AC3100 as the primary router and two AC-66U in access point mode at the edge of the network, all running Merlin.

Thanks!

 

[sfx2000]

Is it sending multi-cast or broadcast packets?

If multicast, one can try IGMP snooping on the primary router (and only on the primary) - if enabled, it'll seek multicast packets and limit the IGMP group to active members.

https://en.wikipedia.org/wiki/IGMP_snooping

(keep IGMP proxy disabled, just enable IGMP snooping if not already enabled)

 

[Veky]

It's probably doing L2 multicast. If IGMP snooping doesn't help, you can try using separate ethernet switches and cables. If this is not possible, you can get a switch which supports VLAN tagging and then create a separate VLAN for these extenders.

 

[Peter Near]

Thanks for the suggestion! I enabled IGMP snooping and it didn't seem to make much difference initially. I made a few other tweaks as well and now the AC3100 seems to be able to handle the load. The two AC-66U access points still become unusable though, and I notice that on one of them the CPU spikes to 100%. Will do some more tweaking when I get a chance.