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DNS - scavenge recommendation? RRS feed

  • Question

  • Hello,

    Which is the best recommendation about scavening stale records? This must be configured on all DNS Servers? Or only on the primary DNS?

    Thanks in advance

    Regards

    Monday, August 28, 2017 8:27 PM

Answers

  • Hi,

    When you have  DNS integrated zones it is enough that you configure DNS aging and scavenging on one server. Configuring DNS scavenging on many servers is usually not recommended. DNS integrated zone will replicate changes to all dns servers.

    It is good to enable it on zones where you have machines that are moving around, or that are coming on and off the network

    I detailed about aging and scavenging so to learn more feel free to visit my site

    https://nedimmehic.org/2017/04/04/how-to-deploy-and-configure-dns-2016-part5/

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    nedimmehic.org


    • Marked as answer by exitista Tuesday, August 29, 2017 12:55 PM
    Monday, August 28, 2017 9:32 PM

All replies

  • Please refer to below link, it has everything about best practice. It is highly recommended to enable scavenging. 

    When scavenging is disabled, stale records must be deleted manually or the size of the DNS database can become large and have an adverse effect on performance. 

    It must be enabled only on one DNS server.

    https://blogs.technet.microsoft.com/networking/2008/03/19/dont-be-afraid-of-dns-scavenging-just-be-patient/

    Monday, August 28, 2017 8:45 PM
  • Hi,

    There are few factors to be considered when configuring aging and scavenging, Basically I use to

    consider followings -

    1) Have a clear idea about refresh time and no refresh interval before you do it, Generally all DNS clients use to refresh their DNS records every 24 hours and Domain controllers every 1 hour.

    2) Be careful when you select default values because your suppose to consider few things here.

    3) If you have a DHCP server for automatic IP allocation consider the lease time of the scope or pool.

    4) Unfortunately aging and scavenging process wont apply on manual DNS records.

    All the best !!!!

    Regards,

    Abdul Majeed Mihdad

    • Proposed as answer by amajeed888 Tuesday, August 29, 2017 9:12 PM
    Monday, August 28, 2017 9:16 PM