ICMP - Raw socket

Hi All,
I am trying to use a icmp socket to receive all the icmp packets that
reaches my machine. If i ping my machine from other pcs, ping is sucessful
which means there are some icmp packets reached my machine, but recvfrom
never returns. But if i ping other pcs from my machine, recvfrom returns
immediately. Could anyone let me know how can resolve this issue?

Here is the code

ZeroMemory(&sLocalSock,sizeof(sLocalSock));

sLocalSock.sin_family = AF_INET;

sLocalSock.sin_addr.S_un.S_addr = inet_addr("172.20.211.72");

//creating the socket
m_sAdvSocket=socket(AF_INET,
SOCK_RAW,
IPPROTO_ICMP);


if(m_sAdvSocket==INVALID_SOCKET)
{

wsprintf(szTempError,"%d no. Error in creating socket in
advertisement",WSAGetLastError());
MessageBox(NULL,szTempError,"Error",0);
return 0;


}


iAdvSockError=bind(m_sAdvSocket,

(SOCKADDR *)&sLocalSock,

sizeof(sLocalSock));

if(iAdvSockError== SOCKET_ERROR)
{

wsprintf(szTempError,"%d no. Error in binding socket in
advertisement",WSAGetLastError());
MessageBox(NULL,szTempError,"Error",0);
return 0;


}






int iSize=sizeof(sLocalSock);

char szIp[3500];

if(SOCKET_ERROR==recvfrom(m_sAdvSocket,(char *)&szIp,3400,0,(struct
sockaddr *)&sLocalSock,&iSize))
{
wsprintf(szTempError,"%d no. Error in receiving in
advertisement",WSAGetLastError());
MessageBox(NULL,szTempError,"Error",0);
return 0;

}


Thanks,
Senthil
.

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