SourceNetworkInterfaceOption::SourceNetworkInterfaceOption() :
     ConfigurationOption(
-        "source-network-interface",
-        value<string>(),
+        "default-source-network-interface",
+        value<string>()->default_value( "" ),
         "The network interface from where the packets will be received and originated"
     )
 {
         Configuration *configuration
 )
 {
-    // source-network-interface
+    // default-source-network-interface
     if ( 1 <= vm.count( get_command_string() ) )
     {
         string source_network_interface = vm[ get_command_string() ].as<string> ();
 
 //-----------------------------------------------------------------------------
 
 /**
- * @brief This class represents the "source-network-interface" configuration
- * option.
+ * @brief This class represents the "default-source-network-interface"
+ * configuration option.
  */
 class SourceNetworkInterfaceOption : public ConfigurationOption
 {