Dual Mode Sockets on XP and Vista - need help from MS !

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Guest

I am using Dual Mode Sockets on Vista - runs fine so far...

I have used the information provided in this article =>
http://blogs.msdn.com/wndp/archive/...ic-applications-part-2-dual-mode-sockets.aspx

So I have the following code in my App.

System.Net.IPEndPoint localEndPoint = new
System.Net.IPEndPoint(System.Net.IPAddress.IPv6Any, 5120);

System.Net.Sockets.Socket listener = new
System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetworkV6,
System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);

listener.SetSocketOption(System.Net.Sockets.SocketOptionLevel.IPv6,
(System.Net.Sockets.SocketOptionName)27, 0);

Never figured out what '27' as SocketOptions mean - just used the Code in
the article of the link above...

Works great on Vista (tested on x86 Business), but when I run the App. under
WinXP (SP2), I get an error with this SocketOption !!

I have installed IPv6 support (installed the Protocol via
ControlPanel->Networking, selected my NIC and Properties, clicked 'install'
and added the IPv6 protocol), but I don't know if there is something more to
do (configure?) - I cannot click on Properties when the IPv6 Protocol is
selected in the NIC's properties dialog!

Questions: why doesn't this code work under XP? do I have to configure
(bind?) the IPv6 protocol to IPv4 (I think this is automatically done on
Vista?!) and how?

Thank you in advance,
Robert
 
Robert said:
listener.SetSocketOption(System.Net.Sockets.SocketOptionLevel.IPv6,
(System.Net.Sockets.SocketOptionName)27, 0);

Never figured out what '27' as SocketOptions mean - just used the Code in
the article of the link above...
Click to expand...

As the article itself explains: "27 is equivalent to IPV6_V6ONLY socket
option". The article also mentions that this option is new to the
Windows Vista network stack, and that the technique described in the
article only work on the new network stack, which supports dual-mode
sockets.
Works great on Vista (tested on x86 Business), but when I run the App. under
WinXP (SP2), I get an error with this SocketOption !!
Click to expand...

Not surprising, since as near as I can tell from the article, the
technique described is not supported on network implementations prior to
Vista.
I have installed IPv6 support (installed the Protocol via
ControlPanel->Networking, selected my NIC and Properties, clicked 'install'
and added the IPv6 protocol), but I don't know if there is something more to
do (configure?) - I cannot click on Properties when the IPv6 Protocol is
selected in the NIC's properties dialog!

Questions: why doesn't this code work under XP? do I have to configure
(bind?) the IPv6 protocol to IPv4 (I think this is automatically done on
Vista?!) and how?
Click to expand...

It seems to me that the reason the code doesn't work under XP is that
it's not supposed to.

As far as the other answers, I have very little experience with IPv6,
but my impression is that you have to explicitly support it in your own
application on XP. There's no such thing as a dual-mode socket in XP,
even if you have IPv6 support installed.

I'm even less clear on the configuration for IPv6 under XP, but assuming
your PC is using IPv6, I doubt that the exact configuration would affect
whether your application can use an IPv6 address, assuming you otherwise
have support for that. You may have to go the "IPv4 mapped address"
route, if there's no explicit IPv6 support in the API. Sorry about my
lack of experience with respect to IPv6...it's probably an easy question
to answer for someone who has actually done it before. :)

Pete
 
Hi Robert,
I unerstand that your dual mode socket server program worked fine on
Windows Vista, however failed to work on Windows XP.
If I have misunderstood, please let me know.

Yes, as Pete mentioned, the value 27 in your code means IPV6_V6ONLY
(defined in ws2ipdef.h in Vista SDK) which is only supported on Windows
Vista. You may refer to:
IPPROTO_IPV6 Socket Options
http://msdn2.microsoft.com/en-us/library/ms738574.aspx

On Windows XP or Windows 2003, to support both IPv4 and IPv6, you need to
create two sockets to do this, one for IPv6, the other for IPv4. Please
refer to the following article:
Dual-Stack Sockets
http://msdn2.microsoft.com/en-us/library/bb513665.aspx

For example:
private void button1_Click(object sender, EventArgs e)
{
Thread tv6 = new Thread(new ThreadStart(StartListenV6));
Thread tv4 = new Thread(new ThreadStart(StartListenV4));
tv6.Start();
tv4.Start();
MessageBox.Show("Started");
}

void StartListenV6()
{
Socket listenerv6 = new Socket(AddressFamily.InterNetworkV6,
SocketType.Stream, ProtocolType.Tcp);
listenerv6.Bind(new IPEndPoint(IPAddress.IPv6Any, 10080));
listenerv6.Listen(0);
while (true)
{
Socket socket = listenerv6.Accept();
byte[] b = new byte[11];
int len;
while ((len = socket.Receive(b)) != 0)
{
System.Console.WriteLine("RX: " +
System.Text.ASCIIEncoding.ASCII.GetString(b, 0, len));
b = new byte[11];
}
socket.Close();
}

}

void StartListenV4()
{
Socket listenerv4 = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
listenerv4.Bind(new IPEndPoint(IPAddress.Any, 10080));
listenerv4.Listen(0);
while (true)
{
Socket socket = listenerv4.Accept();
byte[] b = new byte[11];
int len;
while ((len = socket.Receive(b)) != 0)
{
System.Console.WriteLine("RX: " +
System.Text.ASCIIEncoding.ASCII.GetString(b, 0, len));
b = new byte[11];
}
socket.Close();
}
}

Hope this helps. If you have any other questions or concerns, please feel
free to let us know. Have a good day!

Best regards,
Charles Wang
Microsoft Online Community Support
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