Not sure if this is a bug or I am using the API wrong. Please advise. This is all IPv6-only network.
I have a host with say three network interfaces : eth0, eth1 and eth2 - and I want to listen to advertisements coming only from eth1.

My service listener is based on browser.py example. The api calls look something like this:

class ZeroconfListener:
    """Class for zeroconf to populate"""

    def remove_service(self, _zeroconf, service_type, name):
        """Called when zeroconf when a service is nolonger available"""
       do stuff

    def add_service(self, zeroconf, service_type, name):
        """Called when zeroconf when a service becomes available"""
        do stuff

    def update_service(self, *_):
        """Called internally by Zeroconf."""
        not needed. do nothing

zeroconf = Zeroconf(ip_version=IPVersion.V6Only, interfaces=[addr_of_eth1])
services = ["_device-info._tcp.local."]
ServiceBrowser(zeroconf, services, ZeroconfListener())

while True: # wait forever
    time.sleep(60)

The problem is, I only want to listen to advertisements coming from eth1 but this seems to listen to all the interfaces. I can verify this by publishing a _device-info._tcp.local service from a machine connected on eth0 subnet. I suspect that is because I am not using unicast argument when initialising Zeroconf class, and this line puts a listener on all the interfaces:

TL;DR Question is, how do I restrict zeroconf to a specific interface? Is this a supported use case?