How to connect with distributed database on Oracle Linux with entity framework

I want to connect with distributed database which is on two virtualbox machines with Oracle Linux using entity framework and wcf. Names of machines Oracle DB Developer VM_2 and Oracle DB Developer VM_1. I use NAT with NetworkCIDR=10.0.2.0/24 and Host-only network adapter 192.168.56.1/24 . There are two connections

On first machine

enp0s8: 
ipv4 adress: 10.0.2.5
default route:10.0.2.1
dns 192.168.0.1
enp0s03:
ipv4 adress: 192.168.56.1

on the second machine

enp0s8: 
ipv4 adress: 10.0.2.4
default route:10.0.2.1
dns 192.168.0.1
enp0s03:
ipv4 adress: 192.168.56.102

Does anyone knows how to do it? Please help.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5">
      <assemblies>
        <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
      </assemblies>
    </compilation>
    <httpRuntime targetFramework="4.5" />
  </system.web>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <protocolMapping>
      <add binding="basicHttpsBinding" scheme="https" />
    </protocolMapping>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />
    <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
      -->
    <directoryBrowse enabled="true" />
  </system.webServer>
  <connectionStrings>
    <add name="Entities1" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=Oracle.ManagedDataAccess.Client;provider connection string=&quot;data source=Environment.MachineName:1521/; providerName="System.Data.EntityClient" />

  -->
  </connectionStrings>

  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
  </entityFramework>
</configuration>

EDIT 1

ORA-12154: TNS:could not resolve the connect identifier specified --->
 OracleInternal.Network.NetworkException (0x00002F7A): ORA-12154:
 TNS:could not resolve the connect identifier specified    
 OracleInternal.Network.AddressResolution..ctor(String TNSAlias, String
 instanceName)    
 OracleInternal.Network.OracleCommunication.DoConnect(String
 tnsDescriptor)    
 OracleInternal.Network.OracleCommunication.Connect(String
 tnsDescriptor, Boolean externalAuth, String instanceName)    
 OracleInternal.ServiceObjects.OracleConnectionImpl.Connect(ConnectionString
 cs, Boolean bOpenEndUserSession, String instanceName)    
 OracleInternal.ConnectionPool.PoolManager`3.CreateNewPR(Int32
 reqCount, Boolean bForPoolPopulation, ConnectionString
 csWithDiffOrNewPwd, String instanceName)    
 OracleInternal.ConnectionPool.PoolManager`3.Get(ConnectionString
 csWithDiffOrNewPwd, Boolean bGetForApp, String affinityInstanceName,
 Boolean bForceMatch)    
 OracleInternal.ConnectionPool.OraclePoolManager.Get(ConnectionString
 csWithNewPassword, Boolean bGetForApp, String affinityInstanceName,
 Boolean bForceMatch)    
 OracleInternal.ConnectionPool.OracleConnectionDispenser`3.Get(ConnectionString
 cs, PM conPM, ConnectionString pmCS, SecureString securedPassword,
 SecureString securedProxyPassword)    
 Oracle.ManagedDataAccess.Client.OracleConnection.Open()    
 System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean
 openCondition, DbConnection storeConnectionToOpen, DbConnection
 originalConnection, String exceptionCode, String attemptedOperation,
 Boolean& closeStoreConnectionOnFailure)}