[asio-users] ICMPv6 echo reply has no IP header on Windows 7

[Marcus Frenkel]

Hello,

I experience strange issue on Windows 7 when receiving ICMPv6 echo replies.
The received data is missing the IP header, it only has the ICMP header and
the payload. Some more details below:

# IPv4
replyBuffer.consume(replyBuffer.size());
mySocketIPv4->async_receive(replyBuffer.prepare(65575),..);
--packet received--
replyBuffer.commit(length);
std::istream istr(&replyBuffer);
icmp_header icmp_hdr;
ipv4_header ipv4_hdr
istr >> ipv4_hdr >> icmp_hdr;

Note: The data received has IP header as well

# IPv6
replyBuffer.consume(replyBuffer.size());
mySocketIPv6->async_receive(replyBuffer.prepare(65575),..);
--packet received--
replyBuffer.commit(length);
std::istream istr(&replyBuffer);
icmp_header icmp_hdr;
ipv6_header ipv6_hdr
//istr >> ipv6_hdr >> icmp_hdr; - works on Linux only
istr >> icmp_hdr;

Note: The data only has ICMPv6 header and payload. On Linux, however, the
data starts with the IP header following the ICMPv6 header and the payload.

I need to get some information like TTL, source IP etc from the IP header
when I receive the echo reply. How can I access the IP header data in this
case?

Your help is very much appreciated!

Marcus