good day! Tell me how you can quickly ping the entire network? There is the following code that scans the network.
Public Sub Scan(ByVal subnet As String)
Dim myPing As Ping
Dim reply As PingReply
Dim addr As IPAddress
Dim host As IPHostEntry
Dim active_addr As Integer = 0
ProgressBar1.Maximum = 254
ProgressBar1.Value = 0
ListView1.Items.Clear()
For i As Integer = 1 To 254
Dim subnetn As String = "." & i.ToString()
myPing = New Ping()
reply = myPing.Send(subnet & subnetn, 900)
Label3.ForeColor = Color.Green
Label3.Text = "Scan: " & subnet & subnetn
If reply.Status = IPStatus.Success Then
Try
addr = IPAddress.Parse(subnet & subnetn)
host = Dns.GetHostEntry(addr)
If My.Computer.Network.Ping(host.HostName, 10) Then
ListView1.Items.Add(New ListViewItem(New String() {subnet & subnetn, host.HostName, "True"}))
Else
ListView1.Items.Add(New ListViewItem(New String() {subnet & subnetn, host.HostName, "False"}))
End If
Catch
ListView1.Items.Add(New ListViewItem(New String() {subnet & subnetn, " ", "False"}))
End Try
active_addr += 1
End If
ProgressBar1.Value += 1
Label5.Text = Math.Round((ProgressBar1.Value * 100) / 254, 0, MidpointRounding.AwayFromZero) & " %"
')
ListView1.Items((ListView1.Items.Count - 1)).EnsureVisible()
ListView1.Items((ListView1.Items.Count - 1)).Selected = True
Next i
ListView1.Items(0).Focused = True
ListView1.Items(0).Selected = True
End Sub
But it takes a very long time to scan the network. Tell me, is it possible to do it faster? And can I add the device's MAC address when scanning the network?
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Found a solution that quickly scans the network (a given range of ip addresses).
Tell me. how to add to this code to display the hostname and the MAC address? and add a ProgressBar to show the scan percentage.
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Ping("192.168.1.28", "175")
End Sub
Private Async Function Ping(startIP As String, endIP As String) As Task
Dim start As IPAddress = IPAddress.Parse(startIP)
Dim bytes = start.GetAddressBytes()
Dim leastSigByte = start.GetAddressBytes().Last
Dim range = endIP - leastSigByte
Dim pingReplyTasks = Enumerable.Range(leastSigByte, range).Select(Function(x)
Dim p = New Ping()
Dim bb = start.GetAddressBytes()
bb(3) = CByte(x)
Dim destIp = New IPAddress(bb)
Dim pingResultTask = p.SendPingAsync(destIp)
Return New With {
Key pingResultTask,
Key .addr = destIp
}
End Function).ToList()
Await Task.WhenAll(pingReplyTasks.Select(Function(x) x.pingResultTask))
For Each pr In pingReplyTasks
Dim tsk = pr.pingResultTask
Dim pingResult = tsk.Result
Dim ip = pr.addr
'
DataGridView1.Rows.Add(ip, pingResult.RoundtripTime, pingResult.Status)
Next pr
End Function
