David Connors wrote:
Ah right. So if you're after that then build on Les' suggestion.
1. Look at the local PC's IP configuration. Get the default gateway.
2. Issue and ARP request for the MAC address of that IP (fkd if I know
how you do that in .NET).
3. Send that MAC to your web service.
If that MAC changes, then they have changed the router.
Step 1: Get the gateway address.
From:
http://social.msdn.microsoft.com/forums/en-US/netfxnetcom/thread/c4d1a32a-9bde-4178-bb97-acf7be038949
-------------------------------------
using System.Net.Networkinformation
PGlobalProperties ipProperties = IPGlobalProperties.GetIPGlobalProperties();
foreach (NetworkInterface networkCard in
NetworkInterface.GetAllNetworkInterfaces())
{
foreach (GatewayIPAddressInformation gatewayAddr in
networkCard.GetIPProperties().GatewayAddresses)
{
txt_gateip.Text = gatewayAddr.Address.ToString();
}
}
-------------------------------------
Step 2: Send the machine a message so it's details are in your local arp
table.
This will do: "ping IP.AD.DR.ESS -n 1"
Maybe something like this: (not tested)
|using (Process ping = new Process())
{
ProcessStartInfo startInfo = ping.StartInfo;
startInfo.FileName = "ping.exe";
startInfo.Arguments = "|IP.AD.DR.ESS -n 1|"; // www.example.com
startInfo.UseShellExecute = false;
startInfo.RedirectStandardOutput = true;
||ping||.Start();
// here you could check your 'ping.StandardOutput' to see if the ping
was successful, but who cares?
}
|
Step 3: Check your ARP table.
This can be done by doing a "arp -a" in windows. Your output will be
something like:
Interface: 10.0.2.15 --- 0x10003
Internet Address Physical Address Type
10.0.2.2 00-12-DE-AD-BE-EF dynamic
So same deal as above, except run "arp.exe" with arguments "-a"
Then foreach line in the output, find the one that starts with your
gateway IP address, and your MAC (Physical address) is right next to it.
(split by blankspace/etc)
---------------------------------------
There are a few other ways you can do this with several dlls around,
which avoids the 'hacky-type' process calls, but this should work, and
ping.exe and arp.exe have been around and worked for a long time.
Good luck :)
--
Les Hughes
[email protected]
