diff --git a/src/cudpmsgsocket.cpp b/src/cudpmsgsocket.cpp
index daadd17..45d438d 100644
--- a/src/cudpmsgsocket.cpp
+++ b/src/cudpmsgsocket.cpp
@@ -26,6 +26,20 @@
 #include <string.h>
 #include "cudpmsgsocket.h"
 
+////////////////////////////////////////////////////////////////////////////////////////
+// open
+bool CUdpMsgSocket::Open(uint16 uiPort)
+{
+    bool ret;
+    int on = 1;
+
+    ret = CUdpSocket::Open(uiPort);
+    setsockopt(m_Socket, IPPROTO_IP, IP_PKTINFO, (char *)&on, sizeof(on));
+
+    return ret;
+}
+
+
 ////////////////////////////////////////////////////////////////////////////////////////
 // read
 
diff --git a/src/cudpmsgsocket.h b/src/cudpmsgsocket.h
index 657ed21..f4245c1 100644
--- a/src/cudpmsgsocket.h
+++ b/src/cudpmsgsocket.h
@@ -39,6 +39,9 @@
 class CUdpMsgSocket : public CUdpSocket
 {
 public:
+    // open
+    bool Open(uint16);
+
     // read
     int Receive(CBuffer *, CIp *, int);