Test-Connection

Sends ICMP echo request packets ("pings") to one or more computers.

Syntax

Test-Connection
    [-ComputerName] <string[]>
    [-AsJob]
    [-Authentication <AuthenticationLevel>]
    [-BufferSize <int>]
     [-Count <int>]
    [-Impersonation <ImpersonationLevel>]
    [-ThrottleLimit <int>]
    [-TimeToLive <int>]
     [-Delay <int>]
    [<CommonParameters>]
Test-Connection
    [-ComputerName] <string[]>
    [-Source] <string[]>
    [-AsJob]
    [-Authentication <AuthenticationLevel>]
     [-BufferSize <int>]
    [-Count <int>]
    [-Credential <pscredential>]
    [-Impersonation <ImpersonationLevel>]
     [-ThrottleLimit <int>]
    [-TimeToLive <int>]
    [-Delay <int>]
    [<CommonParameters>]
Test-Connection
    [-ComputerName] <string[]>
    [-Authentication <AuthenticationLevel>]
    [-BufferSize <int>]
     [-Count <int>]
    [-Impersonation <ImpersonationLevel>]
    [-TimeToLive <int>]
    [-Delay <int>]
    [-Quiet] 
    [<CommonParameters>]

Description

The Test-Connection cmdlet sends Internet Control Message Protocol (ICMP) echo request packets, or pings, to one or more remote computers and returns the echo response replies. You can use this cmdlet to determine whether a particular computer can be contacted across an IP network.

You can use the parameters of Test-Connection to specify both the sending and receiving computers, to run the command as a background job, to set a time-out and number of pings, and to configure the connection and authentication.

Unlike the familiar ping command, Test-Connection returns a Win32_PingStatus object that you can investigate in Windows PowerShell. You can use the Quiet parameter to force it to return only a Boolean value.

Examples

Example 1: Send echo requests to a remote computer

This command sends echo request packets from the local computer to the Server01 computer.

Test-Connection Server01

Source        Destination     IPV4Address     IPV6Address  Bytes    Time(ms)
------        -----------     -----------     -----------  -----    --------
ADMIN1        Server01         10.59.137.44                32       0
ADMIN1        Server01         10.59.137.44                32       0
ADMIN1        Server01         10.59.137.44                32       0
ADMIN1        Server01         10.59.137.44                32       1

This command uses the ComputerName parameter to specify the Server01 computer, but omits the optional parameter name.

Example 2: Send echo requests to several computers

This command sends pings from the local computer to several remote computers.

Test-Connection -ComputerName Server01, Server02, Server12

Example 3: Send echo requests from several computers to a computer

This command sends pings from different source computers to a single remote computer, Server01.

Test-Connection -Source Server02, Server12, localhost -ComputerName Server01 -Credential Domain01\Admin01

It uses the Credential parameter to specify the credentials of a user who has permission to send a ping request from the source computers. Use this command format to test the latency of connections from multiple points.

Example 4: Customize the test command

It uses the parameters of Test-Connection to customize the command.

Test-Connection -ComputerName Server01 -Count 3 -Delay 2 -TTL 255 -BufferSize 256 -ThrottleLimit 32

This command sends three pings from the local computer to the Server01 computer.

Use this command format when the ping response is expected to take longer than usual, either because of an extended number of hops or a high-traffic network condition.

Example 5: Run a test as a background job

This example shows how to run a Test-Connection command as a PowerShell background job.

$job = Test-Connection -ComputerName (Get-Content Servers.txt) -AsJob
if ($job.JobStateInfo.State -ne "Running") {$Results = Receive-Job $job}

The first command uses the Test-Connection cmdlet to ping many computers in an enterprise. The value of the ComputerName parameter is a Get-Content command that reads a list of computer names from the Servers.txt file. The command uses the AsJob parameter to run the command as a background job and it saves the job in the $job variable.

The second command checks to see that the job is not still running, and if it is not, it uses a Receive-Job command to get the results and store them in the $Results variable.

Example 6: Ping a remote computer with credentials

This command uses the Test-Connection cmdlet to ping a remote computer.

Test-Connection Server55 -Credential Domain55\User01 -Impersonation Identify

The command uses the Credential parameter to specify a user account that has permission to ping the remote computer and the Impersonation parameter to change the impersonation level to Identify.

Example 7: Create a session only if a connection test succeeds

This command creates a session on the Server01 computer only if at least one of the pings sent to the computer succeeds.

if (Test-Connection -ComputerName Server01 -Quiet) {New-PSSession Server01}

The command uses the Test-Connection cmdlet to ping the Server01 computer. The command uses the Quiet parameter, which returns a Boolean value, instead of a Win32_PingStatus object. The value is $True if any of the four pings succeed and is, otherwise, $False.

If the Test-Connection command returns a value of $True, the command uses the New-PSSession cmdlet to create the PSSession.

Parameters

-AsJob

Indicates that this cmdlet runs as a background job.

To use this parameter, the local and remote computers must be configured for remoting and, on Windows Vista and later versions of the Windows operating system, you must open Windows PowerShell by using the Run as administrator option. For more information, see about_Remote_Requirements.

When you specify the AsJob parameter, the command immediately returns an object that represents the background job. You can continue to work in the session while the job finishes. The job is created on the local computer and the results from remote computers are automatically returned to the local computer. To get the job results, use the Receive-Job cmdlet.

For more information about Windows PowerShell background jobs, see about_Jobs and about_Remote_Jobs.

Type:SwitchParameter
Position:Named
Default value:False
Accept pipeline input:False
Accept wildcard characters:False
-Authentication

Specifies the authentication level that is used for the WMI connection. (Test-Connection uses WMI.)

Valid values are:

  • Unchanged: The authentication level is the same as the previous command.
  • Default: Windows Authentication.
  • None: No COM authentication.
  • Connect: Connect-level COM authentication.
  • Call: Call-level COM authentication.
  • Packet: Packet-level COM authentication.
  • PacketIntegrity: Packet Integrity-level COM authentication.
  • PacketPrivacy: Packet Privacy-level COM authentication.
Type:AuthenticationLevel
Accepted values:Default, None, Connect, Call, Packet, PacketIntegrity, PacketPrivacy, Unchanged
Position:Named
Default value:Packet (4)
Accept pipeline input:False
Accept wildcard characters:False
-BufferSize

Specifies the size, in bytes, of the buffer sent with this command. The default value is 32.

Type:Int32
Aliases:Size, Bytes, BS
Position:Named
Default value:32
Accept pipeline input:False
Accept wildcard characters:False
-ComputerName

Specifies the computers to ping. Type the computer names or type IP addresses in IPv4 or IPv6 format. Wildcard characters are not permitted. This parameter is required.

This parameter does not rely on Windows PowerShell remoting. You can use the ComputerName parameter even if your computer is not configured to run remote commands.

Type:String[]
Aliases:CN, IPAddress, __SERVER, Server, Destination
Position:0
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-Count

Specifies the number of echo requests to send. The default value is 4.

Type:Int32
Position:Named
Default value:4
Accept pipeline input:False
Accept wildcard characters:False
-Credential

Specifies a user account that has permission to send a ping request from the source computer. Type a user name, such as User01 or Domain01\User01, or enter a PSCredential object, such as one from the Get-Credential cmdlet.

The Credential parameter is valid only when the Source parameter is used in the command. The credentials do not affect the destination computer.

Type:PSCredential
Position:Named
Default value:Current user
Accept pipeline input:False
Accept wildcard characters:False
-Delay

Specifies the interval between pings, in seconds.

Type:Int32
Position:Named
Default value:1 (second)
Accept pipeline input:False
Accept wildcard characters:False
-Impersonation

Specifies the impersonation level to use when this cmdlet calls WMI. Test-Connection uses WMI. The acceptable values for this parameter are:

  • Default. Default impersonation.
  • Anonymous. Hides the identity of the caller.
  • Identify. Allows objects to query the credentials of the caller.
  • Impersonate. Allows objects to use the credentials of the caller.

The default value is Impersonate.

Type:ImpersonationLevel
Accepted values:Default, Anonymous, Identify, Impersonate, Delegate
Position:Named
Default value:Impersonate
Accept pipeline input:False
Accept wildcard characters:False
-Quiet

Indicates that this cmdlet suppresses all errors. If any pings succeed, this cmdlet returns $True. If all pings fail, this cmdlet returns $False.

Type:SwitchParameter
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
-Source

Specifies the names of the computers where the ping originates. Enter a comma-separated list of computer names. The default is the local computer.

Type:String[]
Aliases:FCN, SRC
Position:1
Default value:Local computer
Accept pipeline input:False
Accept wildcard characters:False
-ThrottleLimit

Specifies the maximum number of concurrent connections that can be established to run this command. If you omit this parameter or enter a value of 0, the default value, 32, is used.

The throttle limit applies only to the current command, not to the session or to the computer.

Type:Int32
Position:Named
Default value:32
Accept pipeline input:False
Accept wildcard characters:False
-TimeToLive

Specifies the maximum times a packet can be forwarded. For every hop in gateways, routers etc. the TimeToLive value is decreased by one. At zero the packet is discarded and an error is returned. The default value (in Windows) is 128. The alias of the TimeToLive parameter is TTL.

Type:Int32
Aliases:TTL
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False

Inputs

None

You cannot pipe input to this cmdlet.

Outputs

System.Management.ManagementObject#root\cimv2\Win32_PingStatus, System.Management.Automation.RemotingJob, System.Boolean

This cmdlet returns a job object, if you specify the AsJob parameter. If you specify the Quiet parameter, it returns a Boolean. Otherwise, this cmdlet returns a Win32_PingStatus object for each ping.

Notes

This cmdlet uses the Win32_PingStatus class. A Get-WMIObject Win32_PingStatus command is equivalent to a Test-Connection command.

The Source parameter set was introduced in Windows PowerShell 3.0.