Set-DNSServerCache cmdlet

This topic contains 1 reply, has 2 voices, and was last updated by Profile photo of Thom Schumacher Thom Schumacher 11 months, 1 week ago.

  • Author
  • #50807
    Profile photo of Michael Maher
    Michael Maher

    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

    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).

    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



    • This topic was modified 11 months, 1 week ago by Profile photo of Michael Maher Michael Maher. Reason: included Technet url
  • #50838
    Profile photo of Thom Schumacher
    Thom Schumacher

    The datatype for MAXTTL is of Type Timespan:

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

    I believe to set that you can use the new-timespan cmdlet:


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