mDNS Flood with multiple HA instances on same subnet

[dinan5]

The problem

I have four HA instances on my network. Two running HAOS and two running HA Supervised. I've done a bunch of isolation testing including running four instances of HAOS to rule out Supervised as a root cause. After starting the forth instance, I get a massive mDNS storm. Right now I am blocking IPv4 mDNS at the APs, IPv6 mDNS packets are still getting through at a rate of 5300 requests in 30 seconds, it was 4-5 times that before I put the blocks in place. I could really use some assistance understanding why this is occurring and how to stop it. ZEROCONF and SSDP are both disabled.

What version of Home Assistant Core has the issue?

core-2024.10.4

What was the last working version of Home Assistant Core?

unknown - its been months

What type of installation are you running?

Home Assistant OS

Integration causing the issue

multicast

Link to integration documentation on our website

No response

Diagnostics information

I can provide whatever documentation you need - PCAP files, HA logs. please advise as to what would be useful.

Example YAML snippet

Here is my replacement for default config

###################################
#Use a custom config configuration#
###################################
#automation:
cloud:
bluetooth:
config:
counter:
#dhcp:
energy:
#frontend:
history:
#image:
input_boolean:
input_button:
input_datetime:
input_number:
input_select:
input_text:
logbook:
media_source:
mobile_app:
my:
person:
#scene:
schedule:
#script:
#ssdp:
stream:
sun:
system_health:
tag:
timer:
usb:
webhook:
#zeroconf:
zone:
# Customizations

Anything in the logs that might be useful for us?

I can provide whatever documentation you need - PCAP files, HA logs.  please advise as to what would be useful.

Additional information

I can provide whatever documentation you need - PCAP files, HA logs. please advise as to what would be useful.

[mib1185]

Hi @dinan5 This seems to be support request and you should try our Community Forum or join our Discord chat server. Thanks! 👍

[dinan5]

I just did, thanks!