Get Google Speaker Groups and Sonos to work on separate VLANs

Networking Oct 29, 2020

If you have made the smart decision of placing IoT devices on a separate VLAN you may notice that Google Speaker Groups, Sonos and many other systems do not work. This is due to the fact the UDP Broadcast is not reaching the other VLAN’s.

What we'll achive:

Setup UDP Broadcast Relay

What you need:

pfSense terminal or a Linux Box/VM which is on both VLAN's

The following instuctions will be aimed at a Ubuntu System.

Install

Update Linux
sudo apt update && sudo apt upgrade

Make sure Git is installed
sudo apt install git

Download the GitHub Repo
git clone https://github.com/udp-redux/udp-broadcast-relay-redux

Enter the Directory
cd udp-broadcast-relay-redux

Install make
sudo apt install make && sudo apt install gcc

Make the executable
make

Run the executable
sudo ./udp-broadcast-relay-redux --id 1 --port 5353 --dev <NIC1> --dev <NIC2> --multicast 224.0.0.251 -s 1.1.1.1 -f

Create service to start on boot (Optional)

Create systemd service
sudo nano /etc/systemd/system/udp-broadcast-relay.service

Use this as a template:

[Unit]
Description=UDP Broadcast Relay

[Service]
ExecStart=<PATH> --id 1 --port 5353 --dev <NIC1> --dev <NIC2> --multicast 224.0.0.251 -s 1.1.1.1 -f
Type=oneshot
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

PATH = Path to the executable e.g. /home/USER/udp-broadcast-relay-redux/udp-broadcast-relay-redux

NIC1 = Network Adapter name e.g. eth0
NIC2 = Network Adapter name e.g. eth1

Tip: Show all NIC's on Linux with ip addr show