[quoted text, click to view]

Differentiating between a wireless and wired NIC is not the same as
differentiating between an "active" and an "inactive" NIC.

[quoted text, click to view]

Again, what do you mean by "active"? "Currently receiving" doesn't really
do it. Either NIC, as long as its enabled, could be "currently receiving".

Also, what behavior do you expect to achieve by binding to a specific IP
address? Binding will affect what addresses are valid for sending data to
a socket, but it won't affect which NIC is used to send from that socket.

So far, your definition of "active" seems to be tied to which NIC is
actually receiving data, so I don't see the point in trying to bind to a
specific network card in this case, since by your definition your socket
is already only receiving data on the "active" NIC, and that's the most
you could hope for by binding a socket to a specific address.

[quoted text, click to view]

You might want to look at Wireshark (was named "Ethereal"). It's an
already-existing network analysis tool. It might make more sense to just
use that rather than do this yourself.

Hi Neil
I agree with Pete's suggestions.
Anyway I would like to add more comments here. Did you mean that the active
NIC referred to a connected NIC in your LAN? If so, you may consider using
Ping class located in the System.Net.NetworkInformation namespace.
You may refer to:
Simple Ping Utility with GUI
http://www.codeproject.com/KB/IP/SimplePingUtilityWithGUI.aspx?df=100&forumi
d=421321&exp=0&select=2117629&tid=2117629

You may also consider using WMI to check if a NIC is enabled or disabled.
Please refer to:
http://www.visualbasicscript.com/m_3384/tm.htm
http://www.codeguru.com/forum/showthread.php?t=381506

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Please feel free to let us know if you have any other questions or
concerns. Have a nice day!

Best regards,
Charles Wang
Microsoft Online Community Support
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Hi Neil,
Happy New Year!

I would like to check with you to see if you need further assistance on
this issue. Please feel free to let us know if you have any other questions
or concerns. Have a nice day!

Best regards,
Charles Wang
Microsoft Online Community Support
=====================================================
When responding to posts, please "Reply to Group" via
your newsreader so that others may learn and benefit
from this issue.
======================================================
This posting is provided "AS IS" with no warranties, and confers no rights.
======================================================