ping my LAN

[Smurfas]

Hi,
I wish see what is online in my LAN(workgroup).
How I can see another computer IP in my LAN or another information

I guess I could try pinging all the IP addresses in your LAN address range, but how?






Sorry for bad english grammar :[

[Plater]

Figure out what your IP addresses are for your LAN (Probably a 192.168.x.y). Then itterate through all the values of y (1-254) and see who responds?

[Smurfas]

Figure out what your IP addresses are for your LAN (Probably a 192.168.x.y). Then itterate through all the values of y (1-254) and see who responds?

Yes, I now, but how make program this with C#.
How scan lan with C#?

[Daxthecon]

Start -> Run -> cmd -> Ok -> ping -t 192.168.1.101

increment the X to the next number till the ping no longer responds.

If you want to right a program in C# that does this use www.google.com and search for C# Lan View.

[Smurfas]

Start -> Run -> cmd -> Ok -> ping -t 192.168.1.101

increment the X to the next number till the ping no longer responds.

If you want to right a program in C# that does this use www.google.com and search for C# Lan View.

I very long searching in google, but nothing found.

[Plater]

I very long searching in google, but nothing found.

I don't think you searched at all.
.Net HAS a Ping class (System.Net.NetworkInformation.Ping) that cane be used to perform ping operations.

[Curtis Rutland]

I very long searching in google, but nothing found.

O RLY?

Google: C# Ping
First result:
http://msdn.microsoft.com/en-us/libr...tion.ping.aspx

[Smurfas]

O RLY?

Google: C# Ping
First result:
http://msdn.microsoft.com/en-us/libr...tion.ping.aspx

Thanks, but this program testing my ping(only my PC).
This program don't send ping all my lan. I say or not true?

I need program source(C# sample), who make like this program:
http://www.radmin.com/products/utilities/lanscanner.php

[Plater]

Thanks, but this program testing my ping(only my PC).
This program don't send ping all my lan. I say or not true?

I need program source(C# sample), who make like this program:
http://www.radmin.com/products/utilities/lanscanner.php

I already told you what to do.
Iterate through your ip address range values, using PING.
If you had a domain controller, you could do it much "nicer" way.

[Curtis Rutland]

No, this example lets you ping any address you want, not just localhost. Note that args[0] in this example contains an ip address in it. So if you define your own IPAddress instead of args[0] you can specify the address in code.

Example: (using the same code as the MSDN example but adding my own chosen IP Address.

IPAddress address = IPAddress.Parse("192.168.20.1");
PingReply reply = pingSender.Send (address, timeout, buffer, options);
 

Plater has told you to iterate through all your IP addresses, and the MSDN page I sent you to shows you how to ping one address. So, knowing this, you should logically be able to modify the example to ping multiple addresses. It should even be easy enough to put in textboxes in your program to define start and stop ranges.

[Smurfas]

I have one program:

using System;
using System.Net;
using System.Net.NetworkInformation;
using System.Text;
 
namespace Examples.System.Net.NetworkInformation.PingTest
{
    public class PingExample
    {
        // args[0] can be an IPaddress or host name.
        public static void Main(string[] args)
        {
            string server = "127.0.0.1";//address to verify, like 127.0.0.1
            IPAddress ipa = IPAddress.Parse(server);
           Ping p = new Ping();
            PingReply reply;
            reply = p.Send(server);
            int success = 0, insuccess = 0;
            for (int i = 0; i < 4; i++)
            {
               reply = p.Send(ipa);
               if (reply.Address == ipa)
                    success++;
                else
                   insuccess++;
                Console.WriteLine("Pack. sent");
            }
           Console.WriteLine("sent = 4, recived = {0}, lost = {1}", success, insuccess);
           Console.ReadKey();
        }
    }
}

But why always ping not work, send =4, recived = 0, lost = 4

[BageDevimo]

That usually means no packets where recieved from the computer you pinged..

Like, when I ping 127.0.0.1 (which exists) I get:
Sent = 4, Received = 4, Lost = 0
But when I ping 10.1.1.5 (not a pc on my network) i get:
Sent = 4, Received = 0, Lost = 4
Because no computer has responded to my ping request.
So basically if you get Sent 4, recv 4 then you've got a PC there, else there is nothing at that IP.

Ben Anderson,

[Curtis Rutland]

reply = p.Send(ipa);
if (reply.Address == ipa)
  success++;
else
  insuccess++;
 

But why always ping not work, send =4, recived = 0, lost = 4

This isn't the correct way to test if you had a successful ping. Use:

if(reply.Status == IPStatus.Success)
 

I think that the other way, you aren't comparing the actual values, but the reference.

[Curtis Rutland]

That usually means no packets where recieved from the computer you pinged..

Like, when I ping 127.0.0.1 (which exists) I get:
Sent = 4, Received = 4, Lost = 0
But when I ping 10.1.1.5 (not a pc on my network) i get:
Sent = 4, Received = 0, Lost = 4
Because no computer has responded to my ping request.
So basically if you get Sent 4, recv 4 then you've got a PC there, else there is nothing at that IP.

Ben Anderson,

There is always something at 127.0.0.1
There is some other problem there. Likely the coding error I pointed out there, or a firewall blocking the ping requests.

[Plater]

There is always something at 127.0.0.1
There is some other problem there. Likely the coding error I pointed out there, or a firewall blocking the ping requests.

Somewhere in XP there is an option to not respond to icmp requests. It might also not respond to requests on the loopback interface.

[BageDevimo]

Yea, I think its part of the Firewall. SpyBot Search and Destory disables it too, well, if you get TeaTimer.exe anyway.

Meh, doesn't bother me, it's always worked for me. :D

Ben Anderson,

[Daxthecon]

I have Spybot Teatimer on all the laptops in my apartment(friends are computer illeterate with that stuff) as well as AVG for free. Before I start data transfers from there computers(media stuff) I ping them to see so that vista doesn't crash itself. Defualt installs with slight IE modifications and the ping test still work. They are running XP as well.