mDNS advertising does not work
Hello, I recently installed Homebridge via the synology package. Homebridge and it's UI work fine on my Synology as far as I can tell:
`Homebridge v1.6.0 (HAP v0.11.0)`

However, I cannot seem to add Homebridge as an accessory to my Home in iOS. I tried using the Discovery app, and do not see Homebrdige advertising anything under `_hap._udp`.

I also see that Homebridge lists in the status widget that it is using the wrong interface-- I have specified eth0, but in the status widget it lists the interface for a VPN connection, tun0.

Any ideas on how to get Homebridge to use the correct network interface?  I'm guessing thats why I don't see anything in the Discovery iOS app being advertised on my local network. I've tried using Ciao and the legacy HAP advertiser. I've tried restarting the NAS, having my iOS 16.2 device leave and rejoin the network.

Here is the config I've been trying to use:

```
{
    "bridge": {
        "name": "Homebridge 0847",
        "username": "0E:F3:28:24:5E:32",
        "port": 51604,
        "pin": redacted,
        "mdns": {
            "interface": redacted (its the local local LAN IP of my NAS)
        },
        "advertiser": "ciao",
        "bind": [
            "eth0"
        ]
    },
    "accessories": [],
    "platforms": [
        {
            "name": "Config",
            "port": 8581,
            "platform": "config"
        }
    ]
}
```