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POICMPv6 - Cannot read any router advertisement messages
 

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  1. POICMPv6 - Cannot read any router advertisement messages
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    <p>I'm trying to use raw sockets and ICMPv6 to read router advertisement messages on Windows. Through Wireshark, I can see the router (a Cisco 877) sending these messages about every 200 seconds, but my application never receives them.</p> <p>My code takes the following steps:</p> <p>1) Create an IPv6 raw socket using ICMPv6 protocol</p> <p>2) Bind the socket to the IPv6 unspecified address (::)</p> <p>3) Join the link-local all nodes multicast group at FF02::1</p> <p>4) Receive router advertisements (... or not :))</p> <p>The code works fine if I join FF02::16...</p> <p>I've tried setting other socket options like hop limits, multicast hops, to no avail. Any ideas would be welcome, as I am out of them.</p> <pre><code>#include "stdlib.h" #include "winsock2.h" #include "Ws2tcpip.h" #pragma comment(lib, "ws2_32.lib") void main (int argc,char **argv) { WSADATA wsaData; SOCKET nSocket; struct sockaddr_in6 sockinfo; struct ipv6_mreq mreq; char strBuffer[1024]; int nBytes; WSAStartup (MAKEWORD (2,2),&amp;wsaData); // Create a raw socket talking ICMPv6 if ((nSocket = socket (AF_INET6,SOCK_RAW,IPPROTO_ICMPV6)) == SOCKET_ERROR) return; // Bind to :: ::memset (&amp;sockinfo,0,sizeof (sockinfo)); sockinfo.sin6_family = AF_INET6; inet_pton (AF_INET6,"::",&amp;sockinfo.sin6_addr); if (bind (nSocket,(struct sockaddr *) &amp;sockinfo,sizeof (sockinfo)) &lt; 0) return; // Join the link-local all nodes multicast group inet_pton (AF_INET6,"FF02::1",&amp;mreq.ipv6mr_multiaddr); mreq.ipv6mr_interface = 0; if (setsockopt (nSocket,IPPROTO_IPV6,IPV6_ADD_MEMBERSHIP,(char *) &amp;mreq,sizeof (mreq)) &lt; 0) return; // Wait for advertisements for (;;) nBytes = ::recvfrom (nSocket,strBuffer,sizeof (strBuffer),0,NULL,0); closesocket (nSocket); WSACleanup (); } </code></pre>
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