DNS lookup performance
Hello all I've got this to do what I want but thought I'd run it past people who know more than me in the hope someone would be kind enough to advise on the following. The intention is to run this every few minutes using task scheduler, I'll push to one or more machines with an RMM. Questions. Is this an efficient an accurate way to do this? Are there any improvements anyone wants to suggest for the code Am I re-inventing a wheel that I can get somewhere for free or low cost? I'm waiting for the new version of GRC's DNS testing tool so this is a stopgap unless it works well enough. TIA # Define an array to store the DNS Servers to be queried with thier FQDN and IP address $dnsServers = @() # Add 5 hosts with their FQDN and IP addresses $dnsServers += [PSCustomObject]@{ FQDN = "OurDNS1"; IPAddress = "14.15.16.17" } $dnsServers += [PSCustomObject]@{ FQDN = "OurDNS2"; IPAddress = "11.12.13.14" } $dnsServers += [PSCustomObject]@{ FQDN = "Cloudflare"; IPAddress = "1.1.1.1" } $dnsServers += [PSCustomObject]@{ FQDN = "Quad9"; IPAddress = "9.9.9.9" } $dnsServers += [PSCustomObject]@{ FQDN = "Google"; IPAddress = "8.8.8.4" } # Define an array to store target FQDNs $targetFqdns = @( "bbc.co.uk", "www.porsche.com", "www.amazon.co.uk" ) # Get the current date in yyyy-MM-dd format $currentDate = Get-Date -Format "yyyy-MM-dd" # Define the path to the CSV file with the current date in the filename $filePath = "$PSScriptRoot\DNSResults_$currentDate.csv" # Initialize the CSV file with headers if it doesn't exist if (-not (Test-Path $filePath)) { "Timestamp,Milliseconds,TargetURL,DNSServerIP,DNSServer" | Out-File -FilePath $filePath } # Loop through each target host and then each DNS server foreach ($targetFqdn in $targetFqdns) { foreach ($dnsServer in $dnsServers) { # Measure the time taken to run the command $measure = Measure-Command -Expression { nslookup $targetFqdn $dnsServer > $null 2>&1 } # Get the current date and time in ISO 8601 format $timestamp = Get-Date -Format "yyyy-MM-ddTHH:mm:ss" # Get the total milliseconds and round up to a whole number $milliseconds = [math]::Ceiling($measure.TotalMilliseconds) # Append the timestamp, milliseconds, domain, server, and name to the CSV file $result = "$timestamp,$milliseconds,$targetFqdn," $dnsServerUSed = "$($dnsServer.IPAddress),$($dnsServer.FQDN)" $output = $result + $dnsServerUsed $output | Out-File -FilePath $filePath -Append } }
Surface Pro 7 & 8 Suddenly Not Loading Certain Websites and Apps
I moved to a new house and have all the same routers and services. After being here almost 2 weeks, both my Surface Pro 7 & Surface Pro 8 suddenly quit loading certain websites and apps. First noticed Twitter, then Amazon, speed test sites, etc on my Pro 8. Any app that requires internet access won't load. The device always shows that the device is connected to the internet. My email, calendar and some other sites load fine. I went through every diagnostic with a MS agent online and he finally gave up and considered it a hardware issue. The device was under warranty and so I shipped it in for service. I have a Pro 7 also, so I just began to use it. It was fine for about a day, then the same thing started happening. We have changed DNS services, gone through Surface Diagnostic Tool, updated, etc. Every other device in the house is working fine but the Surface devices. I finally got the idea to tether to my phone...and everything works!! So, if I get off of the internet in the house (which it has worked flawlessly with for 2 1/2 yrs) and tether to an outside source, it works fine. It has to be something peculiar to Surface devices. Anyone have any ideas?
BPA Errors: DNS can't resolve GC, Kerberos, PDC Resource Record, etc.
Hello, I've been poking around this for hours now and could use another set of eyes. This server has been the PDC for quite some time but I discovered the last people that managed this place, didn't demote the old 2008R2 server (thankfully it still existed virtualized). So I was able to do a graceful demotion of that and removed it from the domain. I'm now trying to resolve some other errors in that come up in the BPA scan... All reference DNS and I just can't figure this out. I've been beating head against the wall trying to understand what's happening, This is MS Server Standard 2022 only 1 DC and DNS. (yeah I know, don't get me started, but it's a really small office)... Would love some suggestions. Thanks!
