Sonos - how do I "select the specific IP address that should be used for Sonos auto-discovery"?

Configuration
1

I have read the manual, and the sentence that I am wondering about is:

If your Home Assistant instance has multiple IP addresses, you can select the specific IP address that should be used for Sonos auto-discovery with the Network integration. This should only be necessary if the Sonos speakers are on a network segment not reachable from the default interface.

I have exactly that problem, only there are no exaples on how to do that. My main network interface for Hass is 192.168.6.2, which is on my IoT network 192.68.6.x. But I also need a 192.168.2.x connection because of a few devices that are connected to my regular home network. The problem is that the Sonos integration tries to connect via the 2.x network, which doesn’t work because that’s behind a Windows server and the Sonos is on the 1.x network, which is the Internet segment of my network setup (yeah, it’s complicated, but it has it’s reasons).

So how do I choose the network address Hass announces to Sonos?

2

I’d need more specific information on the network setup, routers, specific ip addresses, firewalls, etc.

3

Thanks for answering! But do you really? I am only looking for the correct setting to do as the manual says, choose the network address Hass announces to Sonos with the Network integration. I see now that it uses the correct address some of the times Hass is restarted, other times it tries to use the 2.x network instead.