diff --git a/include/fc/filesystem.hpp b/include/fc/filesystem.hpp
index 1c3d131..5cea39e 100644
--- a/include/fc/filesystem.hpp
+++ b/include/fc/filesystem.hpp
@@ -108,6 +108,7 @@ namespace fc {
   uint64_t file_size( const path& p );
   bool     remove( const path& p );
   void     copy( const path& from, const path& to );
+  void     rename( const path& from, const path& to );
   void     create_hard_link( const path& from, const path& to );
 
   path     unique_path();
diff --git a/include/fc/udp_socket.hpp b/include/fc/udp_socket.hpp
index d7b5a25..e5f0d5e 100644
--- a/include/fc/udp_socket.hpp
+++ b/include/fc/udp_socket.hpp
@@ -1,11 +1,11 @@
-#ifndef _FC_UDP_SOCKET_HPP_
-#define _FC_UDP_SOCKET_HPP_
+#pragma once
 #include <fc/utility.hpp>
 #include <fc/shared_ptr.hpp>
 
 namespace fc {
   namespace ip {
     class endpoint;
+    class address;
   }
 
   /**
@@ -25,6 +25,10 @@ namespace fc {
       size_t send_to( const char* b, size_t l, const fc::ip::endpoint& to ); 
       void   close();
 
+      void   set_multicast_enable_loopback( bool );
+      void   set_reuse_address( bool );
+      void   join_multicast_group( const fc::ip::address& a );
+
       void   connect( const fc::ip::endpoint& e );
       fc::ip::endpoint local_endpoint()const;
 
@@ -34,5 +38,3 @@ namespace fc {
   };
 
 }
-
-#endif
diff --git a/src/filesystem.cpp b/src/filesystem.cpp
index 40993b9..6980572 100644
--- a/src/filesystem.cpp
+++ b/src/filesystem.cpp
@@ -147,6 +147,17 @@ namespace fc {
   bool is_regular_file( const path& p ) { return boost::filesystem::is_regular_file(p); }
   uint64_t file_size( const path& p ) { return boost::filesystem::file_size(p); }
   void remove_all( const path& p ) { boost::filesystem::remove_all(p); }
+  void rename( const path& f, const path& t ) { 
+     try {
+  	    boost::filesystem::rename( boost::filesystem::path(f), boost::filesystem::path(t) ); 
+     } catch ( boost::system::system_error& e ) {
+     	FC_THROW_REPORT( "Rename from ${srcfile} to ${dstfile} failed because ${reason}",
+	         fc::value().set("srcfile",f).set("dstfile",t).set("reason",e.what() ) );
+     } catch ( ... ) {
+     	FC_THROW_REPORT( "Rename from ${srcfile} to ${dstfile} failed",
+	         fc::value().set("srcfile",f).set("dstfile",t).set("inner", fc::except_str() ) );
+     }
+  }
   void copy( const path& f, const path& t ) { 
      try {
   	    boost::filesystem::copy( boost::filesystem::path(f), boost::filesystem::path(t) ); 
diff --git a/src/udp_socket.cpp b/src/udp_socket.cpp
index 814f5f2..334570e 100644
--- a/src/udp_socket.cpp
+++ b/src/udp_socket.cpp
@@ -91,4 +91,17 @@ namespace fc {
      my->_sock.connect( to_asio_ep(e) );
   }
 
+  void   udp_socket::set_multicast_enable_loopback( bool s )
+  {
+    my->_sock.set_option( boost::asio::ip::multicast::enable_loopback(s) );
+  }
+  void   udp_socket::set_reuse_address( bool s )
+  {
+    my->_sock.set_option( boost::asio::ip::udp::socket::reuse_address(s) );
+  }
+  void   udp_socket::join_multicast_group( const fc::ip::address& a )
+  {
+    my->_sock.set_option( boost::asio::ip::multicast::join_group( boost::asio::ip::address_v4(a) ) );
+  }
+
 }