Re: How to solve this ? Serious problem- duplicated records on reverse lookup zones

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Another information:
My Win2003 DHCP Server has the the following settings:

"Server"->Properties->DNS tab shows:
Enable DNS dynamic updates according to the settings below:

(x) Dynamically update DNS A and PTR records only if requested by the DHCP
clients

(x) Discard A and PTR records when lease is deleted.

I think I should select the "Always dynamically update DNS A and PTR
records" instead, right ?
"Marlon Brown" <nomail@xxxxxxxxx> wrote in message
news:%23BWYZX7sFHA.996@xxxxxxxxxxxxxxxxxxxxxxx
> Win2003 DHCP is the one that handles the leases.
> Interesting, you are correct, the Aging button displays 1/1/1601 4:00:00
> PM for the respective zone I am having problems with.
>
> The only thing I have done differently in the last couple of weeks is that
> I got rid of the secondary DNS server and installed a Win2003 DC and made
> that as the secondary DNS server (to be upgraded to DNS-ADI in few days).
> I can't see how this installation of the secondary DNS server would cause
> this problem, but I am saying this just in case.
>
>
>
> "Kevin D. Goodknecht Sr. [MVP]" <admin@xxxxxxxxxxxxxx> wrote in message
> news:%23NMuLJ1sFHA.2756@xxxxxxxxxxxxxxxxxxxxxxx
>> Marlon Brown <nomail@xxxxxxxxx> wrote:
>>> In my organization there is an application that relies on reverse
>>> lookup queries. The application manager is complaining that very
>>> often machines with different host names are pointing to same IP
>>> address. That is causing such application to fail badly.
>>>
>>> I have thousands of laptops in my organization. When I go to the MyDNS
>>> server, I confirm under the respective "Reverse Lookup
>>> Zone/<certain.Subnet> that are three of four host names (mainly
>>> laptops) pointing to same IP address. That's where the problem is.
>>>
>>> For the respective "Reverse Lookup Zone/<certain.Subnet>", I already
>>> configured "No-refresh interval=1 day" and "refresh interval=1 day".
>>> Then I go to the respective "DNS" server node and I select "Scavenge
>>> Stale Resource Records". The duplicated records aren't deleted.
>>> Probably that means I had too many laptops being removed from the
>>> access points and the IP addresses remained there, duplicated and
>>> probably the "Scavenge Stale Resource Records" did not exceed the
>>> no-refresh+refresh interval period. DHCP servers leases = 1 day in my
>>> organization. I don't think I should be decreasing the "no-refresh
>>> interval" and "refresh interval" to less than "1 day" respectively
>>> since I have remote sites (WAN) and that could replication
>>> complications for domain controllers in remote sites.
>>>
>>> Question here, anyone there has an ultimate solution to eliminate such
>>> problems of duplicated IP addresses on the "Reverse Lookup Zones" ? I
>>> need to avoid this problem of having different machine names pointing
>>> to same IP addresses. Please help !
>>
>> This is pretty common in reverse lookup zones, especially with laptops.
>> What
>> is handling DHCP for you? The only option is to make DHCP the owner of
>> the
>> records so DHCP can remove the records when the lease expires.
>> As long as the machines own the record one machine cannot update or
>> remove a
>> PTR registered by another machine.
>> DNS will remove the stale records but not until the time stamp expires
>> and
>> not until the zone becomes available for scavenging. With the DNS
>> management
>> console in Advanced View, what is the Date seen when you click the Aging
>> button?
>> If the date is 1/7/1601 then the zone will not scavenge.
>>
>>
>> --
>> Best regards,
>> Kevin D4 Dad Goodknecht Sr. [MVP]
>> Hope This Helps
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>>
>
>


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