The IP Multicast Initiative

By Bob Quinn

Dr. Dobb's Journal October 1997

nRet = setsockopt(hSocket, 
   IPPROTO_IP, 
   IP_MULTICAST_TTL, 
   (char *)&lTTL, 
   sizeof(lTTL));
if (nRet == SOCKET_ERROR) {
  printf ("setsockopt() IP_MULTICAST_TTL failed, Err: %d\n", WSAGetLastError());
}

Example 5: Set TTL to traverse up to multiple routers.

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