Author Posts

August 17, 2016 at 1:37 pm

Hi Folks,

I'm trying to understand this syntax in the help for Set-DNSServerCache.

The parameter MaxTTL is described as follows in the online help. I'm wondering how I should interpret the datatype

-MaxTtl
Specifies how many seconds (0x0-0xFFFFFFFF) a record is saved in cache. If you use the 0x0 setting, the DNS server does not cache records. The default setting is 0x15180 (86,400 seconds, or one day).
https://technet.microsoft.com/en-us/library/jj649852.aspx

It looks like I pass it the value in seconds but the information provided isn't really clear. I don't want to mess up my DC/DNS.

Furthermore, if I run this cmdlet I get a different format

Get-DnsServerCache -ComputerName localhost | Select MaxTTL, ZoneName
MaxTTL      ZoneName                                                                                                                                         
------      --------                                                                                                                                         
1.00:00:00  .   

There is only one example provided for the Set-DNSServerCache cmdlet and it doesn't cover my use case.

Does anyone know how to interpret this? I don't have a test W2012R2 DC to play with unfortunately

Thanks,

Michael

  • This topic was modified 2 years ago by  Michael Maher. Reason: included Technet url

August 17, 2016 at 3:05 pm

The datatype for MAXTTL is of Type Timespan:

c:\(get-dnsservercache).maxttl -is [timespan]
True
 

I believe to set that you can use the new-timespan cmdlet:
http://go.microsoft.com/fwlink/?LinkId=821837

Thom