public InetAddress autoDiscoverDefaultIP() {
    autoDiscoveredDefaultIP =
        Optional.ofNullable(autoDiscoveredDefaultIP).orElseGet(InetAddress::getLoopbackAddress);

    return autoDiscoveredDefaultIP;
  }
Auto-discovers the default IP of the client.

@return machine loopback address
app/src/main/java/org/hyperledger/besu/cli/options/P2PDiscoveryOptions.java