How to resolve Add-DnsServerResourceRecord descriptivetxt 255 character limitation?

PowerShell Help
1

Hi all,

I’m trying to create DKIM TXT record through powershell using this command:

Add-DnsServerResourceRecord -Txt -ZoneName <some_zone> -Name <some_name> -DescriptiveText $txt

if the $txt string contains more than 255 character it gives an error like this:

Add-DnsServerResourceRecord : InputObject for resource record has an invalid value.

After many hours of digging I came across this alternative, which involves command outside powershell, and it’s deprecated, along with some other problems:

$cmd = 'dnscmd /recordAdd ’ + $domain_name + ’ ’ + $hostname + ’ txt ’ + $SplittedTxt
Invoke-Expression $cmd

$SplittedTxt string here contains multiple texts in quotes like “one” “who” “three”.

My question is, can I do the same with Add-DnsServerResourceRecord command? because no matter what I put there it gives error. How can I use this command to create TXT record with multiple strings in it to avoid single string length limitation?

Thanks

2

Is there more than 255 characters in the text you are sending? That is a typical limitation on the database side for that number of characters. Not sure how breaking it up into multiple texts would subvert the 255 character limitation. Add-DnsServerResourceRecord documentation shows that is a STRING value not a STRING (e.g. string array).

-DescriptiveText
Specifies additional text to describe a resource record on a DNS server.

TABLE 20
**Type:	String**
Position:	Named
Default value:	None
Accept pipeline input:	True
Accept wildcard characters:	False

You did not share what is contained in $txt.

3

$txt contains standard DKIM value like “v=DKIM1; p=MIGf”… but it doesn’t matter what kind of text you put there.

There’s definitely more that 255 characters, yes. But how come I can do more with dnscmd? There must be some way to achieve it with powershell imo.