All containers connected to a specific network share a common DNS namespace, which may lead to confusing conflicts.
Exemple: my frontend container/service is connected to the default network AND the pontsun network. It tries to proxy requests to the backend container/service, but the backend domain name resolves to another backend container from another project that is also part of the pontsun network.
To prevent this issue, we could give an explicit name to the default network (e.g. myproject) and use FQDNs (e.g. backend.myproject) in configuration files such as webpack.config.js.