Duplicate PTR records

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Hello,
I am ending up with duplicate PTR records on my DNS
servers (AD Integrated).

I have Dynamic DNS set with the DHCP server to create the
A and PTR records. I'm seeing current PTR records in the
Reverse Lookup zones, but I'm also seeing older PTR
records from previous DHCP assignments.

Is this a DHCP server issue? Is it a DNS server issue?
Is there a registry key to set somewhere so that only one
PTR record can exist at a time?

Thanks in advance!
Dale

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Dale Nemec wrote:
> Hello,
> I am ending up with duplicate PTR records on my DNS
> servers (AD Integrated).
>
> I have Dynamic DNS set with the DHCP server to create the
> A and PTR records. I'm seeing current PTR records in the
> Reverse Lookup zones, but I'm also seeing older PTR
> records from previous DHCP assignments.
>
> Is this a DHCP server issue? Is it a DNS server issue?
> Is there a registry key to set somewhere so that only one
> PTR record can exist at a time?
>
> Thanks in advance!
> Dale

It is likely the issue is cause from laptop users and users who just power
off their computer without going through shutdown. There isn't much you can
do for this except reduce the lease time.
DHCP should remove the records it registers when the lease expires. Default
is 8 days on a lease.


--?
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
===================================
When responding to posts, please "Reply to Group"
via your newsreader so that others may learn and
benefit from your issue, to respond directly to
me remove the nospam. from my email address.
===================================
http://www.lonestaramerica.com/
===================================
Use Outlook Express?... Get OE_Quotefix:
It will strip signature out and more
http://home.in.tum.de/~jain/software/oe-quotefix/
===================================
Keep a back up of your OE settings and folders
with OEBackup:
http://www.oehelp.com/OEBackup/Default.aspx
===================================

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

>-----Original Message-----
>Dale Nemec wrote:
>> Hello,
>> I am ending up with duplicate PTR records on my DNS
>> servers (AD Integrated).
>>
>> I have Dynamic DNS set with the DHCP server to create
the
>> A and PTR records. I'm seeing current PTR records in
the
>> Reverse Lookup zones, but I'm also seeing older PTR
>> records from previous DHCP assignments.
>>
>> Is this a DHCP server issue? Is it a DNS server issue?
>> Is there a registry key to set somewhere so that only
one
>> PTR record can exist at a time?
>>
>> Thanks in advance!
>> Dale
>
>It is likely the issue is cause from laptop users and
users who just power
>off their computer without going through shutdown. There
isn't much you can
>do for this except reduce the lease time.
>DHCP should remove the records it registers when the
lease expires. Default
>is 8 days on a lease.
>
>
>--
>Best regards,
>Kevin D4 Dad Goodknecht Sr. [MVP]
>Hope This Helps
>===================================

Thanks for the quick reply, Kevin.

I forgot to mention in my earlier post that the DHCP
Lease time is currently set to 1 hour, so they are
already as reduced as I want to go.

Is there nothing else to do then?

Dale

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

This is the expected behavior if you don't align your lease period with your
scavenging period properly. There is a documentation on scavenging on MS
site somewhere.

I have also discussed this lease period/scavenging interval collision on one
of the .dns NGs a while back. My archive doesn't go far back enough.
However, the doument I mentioned above should help you get started on
understanding the reasons for duplicates.

BTW, 1 hour is too short a lease period.

--

Sincerely,
Dèjì Akómöláfé, MCSE+M MCSA+M MCP+I
Microsoft MVP - Directory Services
www.readymaids.com - we know IT
www.akomolafe.com
Do you now realize that Today is the Tomorrow you were worried about
Yesterday? -anon
<anonymous@discussions.microsoft.com> wrote in message
news:1fd201c53ed6$9c1e6bd0$a401280a@phx.gbl...

>-----Original Message-----
>Dale Nemec wrote:
>> Hello,
>> I am ending up with duplicate PTR records on my DNS
>> servers (AD Integrated).
>>
>> I have Dynamic DNS set with the DHCP server to create
the
>> A and PTR records. I'm seeing current PTR records in
the
>> Reverse Lookup zones, but I'm also seeing older PTR
>> records from previous DHCP assignments.
>>
>> Is this a DHCP server issue? Is it a DNS server issue?
>> Is there a registry key to set somewhere so that only
one
>> PTR record can exist at a time?
>>
>> Thanks in advance!
>> Dale
>
>It is likely the issue is cause from laptop users and
users who just power
>off their computer without going through shutdown. There
isn't much you can
>do for this except reduce the lease time.
>DHCP should remove the records it registers when the
lease expires. Default
>is 8 days on a lease.
>
>
>--?
>Best regards,
>Kevin D4 Dad Goodknecht Sr. [MVP]
>Hope This Helps
>===================================

Thanks for the quick reply, Kevin.

I forgot to mention in my earlier post that the DHCP
Lease time is currently set to 1 hour, so they are
already as reduced as I want to go.

Is there nothing else to do then?

Dale

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Deji Akomolafe wrote:

> BTW, 1 hour is too short a lease period.

I agree, one day is as short as you want to go. Check your DHCP server to
see if it is set to remove the records when the lease expires.


--?
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
===================================
When responding to posts, please "Reply to Group"
via your newsreader so that others may learn and
benefit from your issue, to respond directly to
me remove the nospam. from my email address.
===================================
http://www.lonestaramerica.com/
===================================
Use Outlook Express?... Get OE_Quotefix:
It will strip signature out and more
http://home.in.tum.de/~jain/software/oe-quotefix/
===================================
Keep a back up of your OE settings and folders
with OEBackup:
http://www.oehelp.com/OEBackup/Default.aspx
===================================

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

"Kevin D. Goodknecht Sr. [MVP]" <admin@nospam.WFTX.US> wrote in message
news:#W88sd4PFHA.2584@TK2MSFTNGP15.phx.gbl...
> Deji Akomolafe wrote:
>
> > BTW, 1 hour is too short a lease period.
>
> I agree, one day is as short as you want to go. Check your DHCP server to
> see if it is set to remove the records when the lease expires.


It's short but....

Some organizations have a need for such short leases (or shorter).

The class example is the University where students frequently
move their laptops from one room, floor, building.

Also examples are some highly mobile populations with
wireless networks.

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

We use a 12 hour lease, due to the number of users coming and going between
sites...

--
Paul Williams

http://www.msresource.net/
http://forums.msresource.net/

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

"ptwilliams" <ptw2001@hotmail.com> wrote in message
news:egasdP5PFHA.2356@TK2MSFTNGP14.phx.gbl...
> We use a 12 hour lease, due to the number of users coming and going
between
> sites...

I have seen a case made -- even if I didn't like it --
for 15 minutes.

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

Fifteen minutes?!?!?!

WILD!

--
Paul Williams

http://www.msresource.net/
http://forums.msresource.net/

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

"ptwilliams" <ptw2001@hotmail.com> wrote in message
news:#WZ6HkTQFHA.604@TK2MSFTNGP10.phx.gbl...
> Fifteen minutes?!?!?!

> WILD!

A major university Business School (really an IT Business
School) where they required EVERY graduate student to
buy a laptop with networking, and encouraged the undergrads
to do the same. (Now they all are required I think.)

People moving from area to area would take all of the leases
with them.

> --
> Paul Williams
>
> http://www.msresource.net/
> http://forums.msresource.net/
>
>

 

[Guest]

Archived from groups: microsoft.public.win2000.dns (More info?)

I've got a similar issue with duplicate PTR records, but I have the "Remove
the records when lease expires" and several of them are kept WELL beyond the
scavenging schedule. I don't see any errors or related warnings in the
System or DNS logs. Anyone got any clue where to look for why I have some
PTR's going back over 4 months?

Thanks,
-SMFX

"Kevin D. Goodknecht Sr. [MVP]" wrote:

> Deji Akomolafe wrote:
>
> > BTW, 1 hour is too short a lease period.
>
> I agree, one day is as short as you want to go. Check your DHCP server to
> see if it is set to remove the records when the lease expires.
>
>
> --Â?
> Best regards,
> Kevin D4 Dad Goodknecht Sr. [MVP]
> Hope This Helps
> ===================================
> When responding to posts, please "Reply to Group"
> via your newsreader so that others may learn and
> benefit from your issue, to respond directly to
> me remove the nospam. from my email address.
> ===================================
> http://www.lonestaramerica.com/
> ===================================
> Use Outlook Express?... Get OE_Quotefix:
> It will strip signature out and more
> http://home.in.tum.de/~jain/software/oe-quotefix/
> ===================================
> Keep a back up of your OE settings and folders
> with OEBackup:
> http://www.oehelp.com/OEBackup/Default.aspx
> ===================================
>
>
>