diff --git a/src/cg3protocol.cpp b/src/cg3protocol.cpp
index 053da9d..c8fc8a4 100644
--- a/src/cg3protocol.cpp
+++ b/src/cg3protocol.cpp
@@ -33,6 +33,9 @@
 #include <netinet/ip.h>
 #include <netinet/ip_icmp.h>
 
+#if !defined(ICMP_DEST_UNREACH) && defined(ICMP_UNREACH)
+#define ICMP_DEST_UNREACH ICMP_UNREACH
+#endif
 
 ////////////////////////////////////////////////////////////////////////////////////////
 // operation
@@ -157,9 +160,10 @@ void CG3Protocol::PresenceTask(void)
 
     if ( m_PresenceSocket.Receive(&Buffer, &ReqIp, 20) != -1 )
     {
-
         CIp Ip(ReqIp);
-        Ip.GetSockAddr()->sin_port = htons(G3_DV_PORT);
+        socklen_t len;
+        struct sockaddr_in *sin = (struct sockaddr_in *)Ip.GetSockAddr(len);
+        sin->sin_port = htons(G3_DV_PORT);
 
         if (Buffer.size() == 32)
         {
diff --git a/src/cip.h b/src/cip.h
index c5a2f9d..60da8bd 100644
--- a/src/cip.h
+++ b/src/cip.h
@@ -47,6 +47,9 @@ public:
     void SetSockAddr(struct sockaddr_storage *, socklen_t);
     struct sockaddr_storage *GetSockAddr(socklen_t &);
     
+    // converter (IPv6 not supported)
+    uint32 GetAddr(void) const { return ((struct sockaddr_in *)&m_Addr)->sin_addr.s_addr; }
+
     // operator
     bool operator ==(const CIp &) const;
     operator const char *() const;
diff --git a/src/crawsocket.cpp b/src/crawsocket.cpp
index a30908d..f7851c6 100644
--- a/src/crawsocket.cpp
+++ b/src/crawsocket.cpp
@@ -113,7 +113,7 @@ int CRawSocket::Receive(CBuffer *Buffer, CIp *Ip, int timeout)
             Buffer->resize(iRecvLen);
 
             // get IP
-            Ip->SetSockAddr(&Sin);
+            Ip->SetSockAddr((struct sockaddr_storage *)&Sin, sizeof(Sin));
         }
     }
 
@@ -148,7 +148,7 @@ int CRawSocket::IcmpReceive(CBuffer *Buffer, CIp *Ip, int timeout)
             Sin.sin_family = AF_INET;
             Sin.sin_addr.s_addr = remote_iph->ip_dst.s_addr;
 
-            Ip->SetSockAddr(&Sin);
+            Ip->SetSockAddr((struct sockaddr_storage *)&Sin, sizeof(Sin));
 
         }
     }
diff --git a/src/cudpmsgsocket.cpp b/src/cudpmsgsocket.cpp
index 45d438d..1439616 100644
--- a/src/cudpmsgsocket.cpp
+++ b/src/cudpmsgsocket.cpp
@@ -26,17 +26,41 @@
 #include <string.h>
 #include "cudpmsgsocket.h"
 
+// both multiple socket and IPv6 are not supported
+#define MsgSocket m_Socket[0]
+#define MsgIp     m_Ip[0]
+
 ////////////////////////////////////////////////////////////////////////////////////////
 // open
 bool CUdpMsgSocket::Open(uint16 uiPort)
 {
-    bool ret;
-    int on = 1;
+    int on = 1, err = -1;
+    struct sockaddr_storage *ss;
+    socklen_t ss_len;
+
+    if ( !CUdpSocket::Open(uiPort) ) {
+        return false;
+    }
 
-    ret = CUdpSocket::Open(uiPort);
-    setsockopt(m_Socket, IPPROTO_IP, IP_PKTINFO, (char *)&on, sizeof(on));
+    ss = MsgIp.GetSockAddr(ss_len);
+    if ( ss->ss_family == AF_INET )
+    {
+#if defined(IP_PKTINFO)
+        err = setsockopt(MsgSocket, IPPROTO_IP, IP_PKTINFO, (char *)&on, sizeof(on));
+#elif defined(IP_RECVDSTADDR)
+        err = setsockopt(MsgSocket, IPPROTO_IP, IP_RECVDSTADDR, (char *)&on, sizeof(on));
+#endif
+    }
 
-    return ret;
+    if ( err < 0 )
+    {
+        CUdpSocket::Close();
+        return false;
+    }
+    else
+    {
+        return true;
+    }
 }
 
 
@@ -55,12 +79,16 @@ int CUdpMsgSocket::Receive(CBuffer *Buffer, CIp *Ip, int timeout)
     struct iovec Iov[1];
 
     union {
-         struct cmsghdr cm;
-         unsigned char pktinfo_sizer[sizeof(struct cmsghdr) + sizeof(struct in_pktinfo)];
+        struct cmsghdr cm;
+#if defined(IP_PKTINFO)
+        unsigned char pktinfo_sizer[sizeof(struct cmsghdr) + sizeof(struct in_pktinfo)];
+#elif defined(IP_RECVDSTADDR)
+        unsigned char pktinfo_sizer[sizeof(struct cmsghdr) + sizeof(struct sockaddr_in)];
+#endif
     } Control;
 
     // socket valid ?
-    if ( m_Socket != -1 )
+    if ( MsgSocket != -1 )
     {
         // allocate buffer
         Buffer->resize(UDP_MSG_BUFFER_LENMAX);
@@ -80,13 +108,13 @@ int CUdpMsgSocket::Receive(CBuffer *Buffer, CIp *Ip, int timeout)
 
         // control socket
         FD_ZERO(&FdSet);
-        FD_SET(m_Socket, &FdSet);
+        FD_SET(MsgSocket, &FdSet);
         tv.tv_sec = timeout / 1000;
         tv.tv_usec = (timeout % 1000) * 1000;
-        select(m_Socket + 1, &FdSet, 0, 0, &tv);
+        select(MsgSocket + 1, &FdSet, 0, 0, &tv);
         
         // read
-        iRecvLen = (int)recvmsg(m_Socket, &Msg, 0);
+        iRecvLen = (int)recvmsg(MsgSocket, &Msg, 0);
         
         // handle
         if ( iRecvLen != -1 )
@@ -95,17 +123,25 @@ int CUdpMsgSocket::Receive(CBuffer *Buffer, CIp *Ip, int timeout)
             Buffer->resize(iRecvLen);
             
             // get IP
-            Ip->SetSockAddr(&Sin);
+            Ip->SetSockAddr((struct sockaddr_storage *)&Sin, sizeof(Sin));
 
             // get local IP
             struct cmsghdr *Cmsg;
             for (Cmsg = CMSG_FIRSTHDR(&Msg); Cmsg != NULL; Cmsg = CMSG_NXTHDR(&Msg, Cmsg))
             {
+#if defined(IP_PKTINFO)
                 if (Cmsg->cmsg_level == IPPROTO_IP && Cmsg->cmsg_type == IP_PKTINFO)
                 {
                     struct in_pktinfo *PktInfo = (struct in_pktinfo *)CMSG_DATA(Cmsg);
                     m_LocalAddr.s_addr = PktInfo->ipi_spec_dst.s_addr;
                 }
+#elif defined(IP_RECVDSTADDR)
+                if (Cmsg->cmsg_level == IPPROTO_IP && Cmsg->cmsg_type == IP_RECVDSTADDR)
+                {
+                    struct sockaddr_in *DestAddr = (struct sockaddr_in *)CMSG_DATA(Cmsg);
+                    m_LocalAddr.s_addr = DestAddr->sin_addr.s_addr;
+                }
+#endif
             }
         }
     }
@@ -113,4 +149,3 @@ int CUdpMsgSocket::Receive(CBuffer *Buffer, CIp *Ip, int timeout)
     // done
     return iRecvLen;
 }
-