Powershell to update TTL of multple A Records from a file, each A record having multiple IP's

Question

Hi,

I'm referring to the below article from MS. However, the ttl values do not update as expected even after using the same commands as per this article:

https://learn.microsoft.com/en-us/powershell/module/dnsserver/set-dnsserverresourcerecord?view=windowsserver2022-ps

Few queries:

How to update the tl for A records having multiple IP's?

Does the ttl values updated for soa record ensure new records are updated with this updated ttl value?

Regards,

TIA

Answer 1

"A" records don't have multiple IP addresses. What you have are multiple "A" records, each with their own IP address.

Treat the results of the Get-DnsServerResourceRecord the same way you'd treat anything that returned (possibly) multiple objects:

Get-DnsServerResourceRecord -Name BOGUS -ZoneName ATHOME.COM -RRType A |
    ForEach-Object{
        $NewRecord = $_.Clone()
        $NewRecord.TimeToLive = New-TimeSpan -hours 2
        Set-DnsServerResourceRecord -NewInputObject $NewRecord -OldInputObject $_ -ZoneName athome.com
    }

The SOA record sets the minimum TTL for resource records. Whether that applies to new records only, or to all records in a zone, or to just all records in a zone that have a TTL lower than the SOA calls for I don't remember.