App is using 172.16.123.1 as the IP address, which isn't on the network I'm connected to.

Description

When I run yarn start Expo starts running my app on 172.16.123.1:19001, which isn’t the IP I’m using on the only network I’m connected to. Because of this I can’t connect with my device.

Expected Behaviour

I ran yarn start and was expecting it to start my app on my local machine, listening on the my network interface so I can connect from my phone.

Observed Behavior

It started on 172.16.123.1:19001 which isn’t the IP of my machine on the only network I’m connected to.

My IP address is 172.46.0.206 and I’m not connected to any VPN, nor do I have Docker or any virtualisation software running that may create a dummy network adapter.

Environment

Please run these commands in the project folder and fill in their results:

• npm ls react-native-scripts:

grimoire@0.1.0 /Users/harry/dev/haegin/grimoire/grimoire
└── react-native-scripts@0.0.31 

• npm ls react-native:

grimoire@0.1.0 /Users/harry/dev/haegin/grimoire/grimoire
└── react-native@0.44.3 

• npm ls expo:

grimoire@0.1.0 /Users/harry/dev/haegin/grimoire/grimoire
└── expo@17.0.0 

• node -v: v8.1.0
• npm -v:5.0.3
• yarn --version: 0.19.1
• watchman version:4.7.0

Also specify:

1. Operating system:

2. Phone/emulator/simulator & version: OnePlus 3 but I can’t connect it because of this bug.

Reproducible Demo

create-react-native-app grimoire cd grimoire yarn start

[MrLuje]

Or this one, which uses env variables

[itsAmr]

Take a look at this solution, may be helpful: https://github.com/react-community/create-react-native-app/issues/60#issuecomment-317104728