Flushdns and registerdns on multiple machine by powershell - powershell

Question

Simple question but not able to find answer on google at the moment. My powershell version is 2. I want to flush and registerdns on multiple machines.
ipconfig /flushDns
ipconfig /registerdns
I can't use invoke command and psremoting is not enabled on machines.
Any advise how to flushdns & registerdns.

Answer 1

It's pretty easy with Invoke-wmimethod
Create a list of your computers in a file named servers.txt, then create a script like this :
$listofservers = Get-Content .\servers.txt
foreach ($servers in $listofservers) {
Invoke-WmiMethod -class Win32_process -name Create -ArgumentList ("cmd.exe /c ipconfig /flushdns") -ComputerName $servers
Invoke-WmiMethod -class Win32_process -name Create -ArgumentList ("cmd.exe /c ipconfig /registerdns") -ComputerName $servers
}
By default you'll not get the output of the command, but you'll only get information if the command sucessfully ran on remote computer through this value :
ReturnValue
If this value equal to 0 that means the command was sucessfully executed on the remote server.
If you want to get the command output, you can achieve it but adding output redirection to txt file :
$listofservers = Get-Content .\servers.txt
foreach ($servers in $listofservers) {
Invoke-WmiMethod -class Win32_process -name Create -ArgumentList ("cmd.exe /c ipconfig /flushdns > c:\flushdnsresult.txt") -ComputerName $servers
Invoke-WmiMethod -class Win32_process -name Create -ArgumentList ("cmd.exe /c ipconfig /registerdns > c:\registerdnsresult.txt") -ComputerName $servers
}
Then you'll find a txt file on your remote server containing the result output of cmd command.

Answer 2

If you upgrade your powershell version from 2 (highly recommended - I have a powershell & dotnet update script to do this also) you can use:
# Get Windows servers on Domain
####################
$serversraw=Get-ADComputer -Filter {(OperatingSystem -like "*windows*")}
# Filter responsive
####################
$serversup = $serversraw.name | where {Test-Connection $_ -quiet -count 1}
# Flush DNS & reregister
####################
Clear-DnsClientCache -cimsession $serversup
Register-DnsClientCache -cimsession $serversup