scavenging not working - still!

Discussion in 'DNS Server' started by Blake, Jul 17, 2008.

  1. Blake

    Blake Guest

    I am revisiting this issue, as it still exists

    I have a reverse zone (among other things) with nearly 4000 records, most of
    which are 3+ years old. This zone is set to scavenge, the server is set to
    scavenge, and the records are not set to 'do not scavenge'. Yet the records
    persist, months after initially turning the scavenging on.


    Is there a log for this function? Or some way I can trouble shoot it?

    Blake, Jul 17, 2008
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  2. Read inline please.

    Before zones can be scavenged, scavenging has to be enabled on the server,
    as well as the zone.
    To enable scavenging on the server, select the server properties sheet in
    the DNS Management console, Advanced tab, select "Enable automatic
    scavenging of stale records" then set the scavenging period to 1 day longer
    than your DHCP lease period.
    To enabled scavenging on the zone, bring up the zone properties sheet, on
    the General tab, click the Aging button and select "Scavenge stale resource
    Scavenging will log in the event log, see:

    Best regards,
    Kevin D. Goodknecht Sr. [MVP]
    Hope This Helps

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    Kevin D. Goodknecht Sr. [MVP], Jul 17, 2008
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  3. Blake

    Blake Guest

    I appreciate your comments Kevin, however:

    1) I've already enabled scavenging on both the zone and the server (some
    months ago, actually)
    2) I get an event when scavenging is triggered, but it doesn't remove the
    offending records

    Right now it appears the DHCP leases are set to 8 days, and I have
    scavenging setup for the default (7 days). I will make this correction and
    report back.

    Blake, Jul 18, 2008
  4. In
    Static addresses will not purge since they have an infinite TTL.

    Ace Fekay [MVP], Jul 20, 2008
  5. Blake

    Blake Guest

    My problem is I have, for example, 15 records for (15 "1's" in
    the reverse zone). I want the scavenger to delete all the "1's" with an old
    stamp and leave the new ones (no static addresses)

    This zone is old and scavenging was never turned on before. I have a
    reverse zone for a Class C which as nearly 4 THOUSAND records.

    It isn't pretty.
    Blake, Jul 21, 2008
  6. In
    Is there anything in the DNS Event logs? If not, try increasing logging in
    DNS properties and see what shows up in the Event logs.

    Also, are they all static entries or were they all DHCP entries?

    Ace Fekay [MVP], Jul 22, 2008
  7. Blake

    Blake Guest

    They should all be DHCP entries

    Blake, Jul 22, 2008
  8. In
    Sorry if this was addresses (trying to remember back) but did you add the
    DHCP server to the DnsProxyUpdate group? If so, unfortunately it will not
    delete previously created entries. Look at one of the previous entries not
    being scavenged. What is it's TTL? (Put it in Adv view to see that info).

    Also, there is a time delay with scavenging as well.

    Ace Fekay [MVP], Jul 24, 2008
  9. Blake

    Blake Guest

    Adding the account to that group removes the benefit of secure updates (or
    so the MS docs I have read on the subject say).

    The account which is running DHCP should have read/write to all the records
    (I have set it up as an AD user, which is a member of a group which as full
    access). I DID change the user that DHCP was using to register the records,
    however. (It was using a computer account and that machine was replaced, so
    I set it up as a domain user). I have to think that is part of the issue,
    as I've never seen this before.

    Also - if the scavenging is a function of the DNS server, why would the DHCP
    permissions matter? (not arguing, just curious)

    The TTL for some I checked is 15 minutes.

    Blake, Jul 25, 2008
  10. In
    Not necessarily part of scavenging, but if DHCP owns the record, it will
    update a record with its new IP instead of creating a new one with the old
    one still there.

    As for as the way you did it, I haven't tried that and not able to comment
    on it. Sorry.

    Ace Fekay [MVP], Jul 27, 2008
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