Device Isolation vs. UDP Broadcasts on Ethernet Backhaul
Hi everyone,
I’ve just upgraded my home network from an old Google Nest Mesh to a Deco XE75 Pro (3-pack). My setup is a wired "star" topology across three floors:
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Main Deco -> Main Switch -> Individual runs to each floor.
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Satellite Decos -> Plugged into "dumb" switches on their respective floors.
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Backhaul: All units show as "Ethernet" in the app.
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The Problem: I have a very chatty battery storage system (SigenStor) wired into one of the remote switches. It emits a constant UDP broadcast on Port 21320 at roughly 20Hz. This "heartbeat" is flooding my entire wired backbone and is even visible to wireless clients on both my Main and IoT networks.
Device Isolation Issue: I applied the "Device Isolation" feature in the Deco app to this specific device. While I expected this to "mute" the device, the 20Hz broadcast is still hitting every client on the network.
My Questions:
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How exactly does Device Isolation work? It seems to block unicast (device-to-device) traffic but completely ignores Layer 2 broadcasts. Is this intended behavior, or is there a way to make it drop broadcast packets at the source node?
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Managed Switches & VLANs: Since my switches are currently "dumb," they are blindly repeating this noise. If I upgrade to managed switches (e.g., TL-SG105E) to use Port-Based VLANs or Storm Control, will the Deco system play nice?
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I don't see any advanced VLAN/Tagging options in the Deco app for the Main/IoT networks other than for IPTV. How should I best architect this to kill the broadcast noise without breaking the Ethernet Backhaul?
Any advice from someone who has successfully "silenced" a chatty wired device on a Deco mesh would be greatly appreciated!
JM
Hi, welcome to the community.
I'm not confident of the reported issue either. If you could provide more details, I'd like to forward your case to the senior engineer for further assistance.
- Have you observed any network issues on the devices when the UDP packets were flooding the entire wired backbone and wireless networks?
- Can I have the model numbers of the network switches?
- Is the network topology like:
Thank you very much.
Best regards.
Thanks @David-TP
This is roughly what it looks like:
All the switches are Netgear GS105/8 (the dumb ones). I am trying to filter out the UDP Broadcast from the Sigentor. I am not too worried about the LAN part. I also have 30+ IoT devices on the IoT Wifi from the Deco, and they all see that UDP broadcast. This is really what I am trying to filter out. IoT do not like that permanent noise and I suspect is responsible for random drop outs. I tagged the SigenStor as an isolated device, but that does not stop the noise. I could comfirm it on my phone using a UDP Monitor app.
I suspect I will have to replace the Netgear GS105/8 by managed swiches, and start to tag a VLAN for the SigenStor. That will also require the X75Pro to play along. Am I on the right track? or is there a better way? (re-running the cables isn't really an option)
Does that answer your questions David?
Thanks
JM