I pinged the servers and it is working (it shows me the ip address that could be pinged) but I want it to show the hostname and the ip address.
I tried to incorporate [System.Net.Data.Dns]::GetHostName(), but I don't know where to put it. I am a beginner using PowerShell. I also tried to used -and, but it doesn't work.
I understand how to do it python I just don't know how to translate it to PowerShell.
$columnC = "n1-1mon-i3fp04","n1-1mon-i3fp06","n1-1mon-i3fp07","n1-r-1mon-i3fp09","n1-r-1mon-i3fp10","n1-1mon-i3fp08","n1-1mon-i3fp03","n1-1mon-i3fp02","n1-1mon-i3fp111"
$columnC | % $_ {$Device = Resolve-DnsName -Name $_
$Device.[System.Net.Data.Dns]::GetHostName()
if (test-connection $Device.("IPAddress")) {write-host Device.("IPAddress") "Ping succeeded." -foreground green}
else {write-host $Device.("IPAddress") "Ping failed." -foreground red}}
The result shows an error message like the syntax is wrong. I want it to show both ip address and the hostname.
[edit - Theo pointed out that GetHostByName has been deprecated in favor of GetHostEntry. when i tested that, it gave more consistent results, so i swapped them.]
this will get the ComputerName, HostName, and Online status. then save those into a custom object, send the object to the $Results collection, and - finally - show what is in the collection. [grin]
# fake reading in a text file
# in real life use Get-Content
$ComputerList = #'
BetterNotBeThere
LocalHost
10.0.0.1
127.0.0.1
'# -split [environment]::NewLine
$Results = foreach ($CL_Item in $ComputerList)
{
try
{
$HostName = [System.Net.Dns]::GetHostEntry($CL_Item).HostName
}
catch
{
$HostName = '__Not Found__'
}
[PSCustomObject]#{
ComputerName = $CL_Item
HostName = $HostName
Online = Test-Connection -ComputerName $CL_Item -Count 1 -Quiet
}
}
$Results
output ...
ComputerName HostName Online
------------ -------- ------
BetterNotBeThere __Not Found__ False
LocalHost [MySysName] True
10.0.0.1 __Not Found__ False
127.0.0.1 [MySysName] True
Related
One Bronze medal = Newbi 😊, have scoured this site for years, so a million belated thanks, once again!
Just finished up a few different PowerShell ver 5.1 scripts that perform a test-connection on the same 2000 devices regularly.
Out to a csv file
And they are all slow, some minor speed improvements when tweaking it down to the bare bones.
I’ve scaled the script to the minimal, IPADDRESS and NAME only
I’ve run a few comparison tests against a batch file (ping 123.456.789.001 >> PingTest.txt ) and these tests APPEAR to run quicker than my PS script (will run a full apple to apples test tomorrow), but confident something is amiss in the PS code.
Am looking at arrays, and how piping works, but am afraid I’m putting the cart in front of the horse, or there is something going on with how PS handles the csv format and/or ping list in its memory
My most efficient current script below,
Is the following link pointing me in the right direction,? Specifically the asJob switch
PowerShell Mass Test-Connection
$info = "" | Select IPaddress,Name
$OutputFile = new-item -itemType File -path C:\Temp\Results.csv -force -value "IPaddress,Name`r`n" | out-null
Import-csv C:\Temp\GetList.csv | ForEach-Object {
if ($_.IPaddress) {
if (-Not (Test-Connection -ComputerName $_.IPaddress -Quiet -Count 2 -ErrorAction SilentlyContinue)) {
$info.IPaddress = $_.IPaddress
$info.Name = $_.Name
add-content -value "$($info.IPaddress),$($info.Name)" -path C:\Temp\Results.CSV
}
}
}
The export-csv is faster, thank you. I'm not sure if I have it in the right place, but it works, will run some tests on it tomorrow. I may have to include the passes tests though , still getting my head around the get-job cmdlet.
$info = "" | Select IPaddress,Name,Status
Import-csv c:\Temp\GetList.csv | ForEach-Object {
if($_.Ipaddress) {
if (-Not(Test-Connection -ComputerName $_.IPaddress -Quiet -Count 2 -ErrorAction SilentlyContinue)) {
$info.IPaddress = $_.IPaddress
$info.Name = $_.Name
$info.Status = "Failed"
$info | export-csv C:\Temp\Results1.csv -Force -Notypeinformation -Append
}
}
}
$list = Import-Csv C:\Temp\GetList.csv
ForEach ($item In $list) {
Start-Job -ScriptBlock {
param($item)
if (Test-Connection -Computername $item.IPaddress -Quiet -Count 1) {
Add-Content -value "$($item.IPaddress),$($item.Name),$($item.Stauts)" -Path C:\Temp\xlistlist.csv
$list | Export-csv c:\Temp\xCSvreults.csv -Force -NoTypeInformation -Append
}
} -argumentlist $list
}
Thanks Santiago, I did some exploring here, just ran out of time for the day. THANK YOU you for the code examples they cleared a few things up for me :-) –
Have Computer
Dec 2 at 3:59
Would you mind adding some inline comments so I can follow along? Just trynna understand multi-threading (using runspaces) a bit better. –
Abraham Zinala
Dec 2 at 4:58
1
#AbrahamZinala is there a specific part you're struggling to understand? i'm not an expert on this and wouldn't like to give false information. Might be better to pick up all the parts you don't understand and ask a new question –
Santiago Squarzon
Dec 2 at 12:19
Nah man, sorry, I figured it out lol –
Abraham Zinala
Dec 2 at 13:43
1
#AbrahamZinala the only hard part to understand is the [powershell] instance part imo, and you can think of it as a Start-Job but much faster and less memory consuming, you add your scriptblock with .AddScript({...}) and then the parameters with .AddParameters([hashtablehere]). It's important to save the PSInstance in a variable so that we can get the output out of it and it's handler (Status = $psinstance.BeginInvoke()) to know when the instance has completed. The rest is just pure blueprint, once you have one you can copy paste it :P –
Santiago Squarzon
Dec 2 at 13:50
#HaveComputer I have no idea what your comment means. –
Santiago Squarzon
Dec 5 at 1:10
the 2 solutions presented work much faster, my code however is lacking. –
Have Computer
Dec 5 at 1:16
#HaveComputer I know that, this can perform 50x faster or even more depending on hardware and bandwidth. –
Santiago Squarzon
This is a good place where you can use runspaces, I would love to test if Test-Connection -AsJob performs better than this but for some reason it is not available on PS Core on Linux.
Code below took around 10 seconds to scan 254 IPs using my private network IP range. There is a lot of tweaking that can be done, i.e. you can poke around the $Threshold variable, it's currently running 100 runspaces at a time, Count and TimeoutSeconds for Test-Connection have been set to 2 you can tweak that too.
$results variable can be exported using Export-Csv.
# Change this value for tweaking
$Threshold = 100
$RunspacePool = [runspacefactory]::CreateRunspacePool(1, $Threshold)
$RunspacePool.Open()
# This is for testing, use your CSV here instead
# => $list = Import-Csv C:\Temp\GetList.csv
$list = 1..254 | ForEach-Object {
[pscustomobject]#{
IPAddress = "192.168.1.$_"
Hostname = "ExampleHost$_"
}
}
$scriptBlock = {
param($ip, $hostname)
$params = #{
Quiet = $true
Count = 2
TimeoutSeconds = 2
ComputerName = $ip
}
$status = Test-Connection #params
[pscustomobject]#{
Hostname = $hostname
IPAddress = $ip
Status = ('Failed','Success')[[int]$status]
}
}
$runspaces = foreach($line in $list)
{
$params = #{
ip = $line.IPAddress
hostname = $line.Hostname
}
$psinstance = [powershell]::Create().AddScript($scriptBlock).AddParameters($params)
$psinstance.RunspacePool = $RunspacePool
[pscustomobject]#{
Instance = $psinstance
Status = $psinstance.BeginInvoke()
}
}
while($runspaces.Status.IsCompleted -contains $false)
{
Start-Sleep -Milliseconds 500
}
$results = $runspaces.ForEach({ $_.Instance.EndInvoke($_.Status) })
$RunspacePool.Dispose()
$results Sample:
Hostname IPAddress Status
-------- --------- ------
ExampleHost1 192.168.1.1 Success
ExampleHost2 192.168.1.2 Failed
ExampleHost3 192.168.1.3 Success
ExampleHost4 192.168.1.4 Failed
ExampleHost5 192.168.1.5 Success
ExampleHost6 192.168.1.6 Failed
ExampleHost7 192.168.1.7 Failed
ExampleHost8 192.168.1.8 Failed
ExampleHost9 192.168.1.9 Failed
ExampleHost10 192.168.1.10 Failed
...
...
Start-Job -ScriptBlock { Test-Connection -computername (Get-Content -Path “C:\Temp\GetList.csv”) }
Its lacking the fundamentals, works, DE fast.
I have DHCP script that looks for matching hostnames in all the scopes on the DHCP servers
I first get all the DHCP servers and import a .txt of hostnames
$list = Get-Content C:\script\HostNameList.txt #Defines content it pulls as list
$DHServers = Get-DhcpServerInDC #gives variable name for loop
# Gets all DHCP servers ands scopes
foreach ($Server in $DHServers){
$scopes = Get-DHCPServerv4Scope -ComputerName $Server.dnsname #get all scopes
}
I loop through list of hostnames and scopes looking for a match. Somewhere in here is my issue
$Output = foreach ($hostname in $list) { #Calls each item in list a hostname and sends to output
if (test-connection -count 1 -computername $hostname -quiet) #With 1 ping, check if hostname is online
{
foreach ($scope in $scopes){
if($scope | Get-DhcpServerV4Lease -ComputerName $server.dnsname | Where-Object HostName -like "$hostName*" ) #compares the hostname to lease to find which scope it is in
{ $scope.name } #return scope it found hostname in
}
[PSCustomObject]#{ #Rename varibles in data pull for output file
Asset = $hostname
Location = $scope.name #only want the name of the scope
Status = "Online"
}
}
else #statement if hostname is not online
{
Write-host "$hostname Is offline, only Last Location is known. $hostname was added to the output file." -BackgroundColor DarkRed
[PSCustomObject]#{
Asset = $hostname
Location = $scope.name #only want the name of the scope, since the name = Location
Status = "Offline"
}
}
}
$Output #show output in powershell
$Output | Export-Csv -Path C:\script\Asset_Result.csv -NoTypeInformation #outputs .csv
This is what it is doing, the output repeats the last item on the list of DHCP scopes.
Asset Location Status
----- -------- ------
A847 Public Internet Online
A261 Public Internet Offline
A201 Public Internet Online
This is what it should be doing
Asset Location Status
----- -------- ------
A847 FLoor 1 Online
A261 West 1st FL Offline
A201 Floor 3 Online
How can I get $scope.name in my
if($scope | ... statement to go to my PSCustomObject after each iteration?
This:
foreach ($Server in $DHServers){
$scopes = Get-DHCPServerv4Scope -ComputerName $Server.dnsname #get all scopes
}
is - in net effect - the equivalent of:
$scopes = Get-DHCPServerv4Scope -ComputerName $DHServers[-1].dnsname #get all scopes
That is, you keep reassigning to the same variable ($scopes) in the loop body, replacing the previous value, so that you end up with only the result from the last loop iteration, for the last server stored in $DHServers, i.e. $DHServers[-1].
The best solution is to rely on PowerShell's ability to use statements such as foreach as an expression whose output - even iterative output from a loop - is automatically collected in an [object[]] array (with two or more outputs) by PowerShell:
# Collect the output from *all* Get-DHCPServerv4Scope calls.
[array] $scopes = foreach ($Server in $DHServers) {
Get-DHCPServerv4Scope -ComputerName $Server.dnsname #get all scopes
}
Note: The [array] type constraint (same as: [object[]]) is only necessary if there can situationally be just one output object and you want to ensure that the collected output is always an array.
I am working on a little powershell 3.0 GWMI script that pulls computer information for use in an enterprise environment (ip, mac address, etc).
I'm trying to go through the WMI properties for NetworkAdapterConfiguration to see if there is a way to check for a reserved IP vs. a dynamically assigned one.
Would anyone have advice on how to pull this from WMI or elsewhere? Does (preferred) always indicate that an IP is reserved on the network?
I'm finding a lot of information for powershell and Azure but not a ton for figuring this out on a local box.
As Ron Maupin noted, Host computers will only know whether they were assigned an addressed from the DHCP, not if there was a reservation. But they will report which DHCP server they received their address from. So you can query that server (assuming you have read permissions).
Here is a script that after retrieving the information from a computer over WMI will check with the DHCP server if a reservation exists.
$ComputerName = "ExampleComputer"
$NetAdapters = Get-WmiObject Win32_NetworkAdapterConfiguration -ComputerName $ComputerName | ? {$_.DHCPEnabled -eq $True -and $null -ne $_.IPAddress}
If ($NetAdapters) {
Foreach ($Adapter in $NetAdapters) {
foreach ($IP in $Adapter.IPAddress) {
$Reservation = Get-DhcpServerv4Reservation -ScopeId $IP -ComputerName $Adapter.DHCPServer | ? {$_.ScopeId -eq $_.IPAddress}
If ($Reservation) {
Write-Output "$IP is reserved on $($Adapter.DHCPServer)."
} Else {
Write-Output "$IP does not have a reservation."
}
}
}
} Else {
Write-Output "No DHCP Enabled NetAdapters with IPAddresses exist on host, likely Static"
}
Using the above script provided by BenH I was able to cobble together a script that worked across my fleet of AWS servers from SSM using the AWS-RunPowerShellScript run document which would give me a fail status if any of my instances weren't configured for DHCP. We had a few lingering out there which were using our DHCP Options Set in our VCP and this helped uncover them. Thanks!
$NetAdapters = Get-WmiObject Win32_NetworkAdapterConfiguration | ? {$_.DHCPEnabled -eq $True -and $null -ne $_.IPAddress} | Select Description
If ($NetAdapters) {
Foreach ($Adapter in $NetAdapters.Description) {
Write-Output "DHCP is enabled on $Adapter"
exit 0
}
} Else {
Write-Output "DHCP is not enabled on any adapters on host, likely Static"
exit 1
}
I'm running a DHCP server in Windows Server 2012 R2 with an active scope and I've made a script which asks the user for a MAC address and will then reserve an available ip from the scope to the user's MAC.
The actual reservation works without a problem but I've introduced an IF ELSE statement, with the hope that the conditional expression is evaluated as TRUE when a reservation is successful and to FALSE otherwise.
But the expression always evaluates to FALSE because storing the execution of the cmdlet Get-DhcpServerv4Reservation into a variable and then printing it, yields a really messed up output: basically it will print "DHCPServerv4Reservation" as many times as reservations present in the scope, instead of the output given when directly executing the cmdlet.
Here's the code:
clear-host
$mac=read-host -prompt "Please type the MAC address for the host "
$freeip=Get-DhcpServerv4FreeIPAddress -scopeid 10.10.10.0
Add-DhcpServerv4Reservation -ScopeId 10.10.10.0 -ClientId $mac -IPAddress $freeip
$reservedips=Get-DhcpServerv4Reservation -ScopeId 10.10.10.0
if ($reservedips -match $freeip) {
write-host "The ip $freeip has been succesfully reserved for the host with the MAC address $mac"
}
else {write-host "I'm sorry but there are no free ip addresses to be reserved"}
# this is just to see what's inside $reservedips
write-host $reservedips
Why is this happening? Thanks
The result of Get-DhcpServerv4Reservation is a reservation object.
The -match operator is for matching a string against a regular expression.
You might be looking to something like:
if (($reservedips | Where-Object { $_.IPAddress -eq $freeip })) {
# success
}
I think you consider restructuring your code to look something like this:
$mac=read-host -prompt "Please type the MAC address for the host "
$freeip=Get-DhcpServerv4FreeIPAddress -scopeid 10.10.10.0
try {
Add-DhcpServerv4Reservation -ScopeId 10.10.10.0 -ClientId $mac -IPAddress $freeip -ErrorAction Stop
} catch {
Write-Host "An error has occurred while trying to add a reservation for '$mac' with IP '$freeip'."
}
Adding -ErrorAction Stop forces all exceptions to be caught by the try/catch block.
This is the alternative I have come up with, which works
clear-host
$mac=read-host -prompt "Please type the MAC address for the host "
$freeip=Get-DhcpServerv4FreeIPAddress -scopeid 10.10.10.0
Add-DhcpServerv4Reservation -ScopeId 10.10.10.0 -ClientId $mac -IPAddress $freeip
$reservedips=Get-DhcpServerv4Reservation -ScopeId 10.10.10.0 | Where-Object ipaddress -eq $freeip
if ($reservedips -eq "") {write-host "I'm sorry but there are no free ip addresses to be reserved"}
else {write-host "The ip $freeip has been succesfully reserved for the host with the MAC address $mac"}
I am trying to read the host file and trying to ping the each host name and after that capturing the IP address in the response and trying to match with the IP address mentioned in the host file.
I have three scenarios:-
1) Its pinging the host and getting the reply back with the correct IP
Result :-Resolved and Replied
2) It's Not pinging at all and not resolving the IP
Result :-Not Resolved and Not Replied
3) It's Pinging but not resolving the IP correctly mentioned to the IP in the host file
Result :-Not Resolved and Replied
I am trying to achieve that scenario with the below script but not fully achieved as different expression need to be used.
Can someone help me to finish it
$lines = Get-Content myfile.txt | Where {$_ -notmatch "((^#)|(^\s+$))"}
# get all test pairs
$tests=$lines |
ForEach-Object{
$fields = $_ -split '\s+'
echo " Fields are $fields"
for ($i = 1; $i -lt $fields.Length; $i++){
New-Object PsObject -Property #{IP=$fields[0];Host=$fields[$i]}
}
}
$tests |
ForEach-Object{
$props=#{
IPAddress=$_.ip
Hostname=$_.Host
Resolve =' '
Reply = ' '
}
$PingResult = ping -n 1 -w 10 $_.host
#echo "$PingResult"
foreach ($line in $PingResult)
{
if ($line.StartsWith("Pinging") -eq $true)
{
$_.ip= $line -match '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}'
echo "IP is $IP"
if ($matches[0])
{
$props.Resolve ='Y'
$props.Reply='Y'
}
else
{
$props.Resolve ='Y'
$props.Reply='N'
}
}
}New-Object PsCustomObject -Property $props
}|
Format-Table -AutoSize | Out-String | Out-File D:\CEP\testlogging.txt
Note:- Cannot use Test-Connection because it throws exception when server wont reply back or doesnot exist and it takes more time to ping.
Thanks.
Suppose it's too late to be of much help but this should resolve the issues you are reporting with Test-Connection.
Test-Connection -ComputerName $IP -Count 1 -ErrorAction SilentlyContinue
That will limit the ping count to 1 and error will be ignored. Then you can work with the object it produces instead of having to parse lines.