DNS host a records disappearing!

Hi!

We have a big problem with DNS host A records disappearing from their
zones... everything is configured automatic, so when DHCP give an address,
the client is registrered into dns automatically, but some of them, are
disappearing from the zones, even if they are still running (not stale!!!).

We look at TTL on automatically created records, and it is set to 15 min.,
the default value... when we run ipconfig /registerdns, the record came back,
and last more thant 15 min., but later during the day, the record is deleted
from dns... from which process, we really don't know?

Somebody knows why?

Claude Lachapelle
Systems Administrator, MCSE

We found it!

On a second server, we are working on a new DHCP server (not yet authorized
in AD), which will be used for split-scope configuration with the first one,
and even if all the imported scopes are deactivated, and the server not
authorized, when we delete a record lease, IT DELETE THE ASSOCIATED HOST A
RECORDS FROM DNS!!!

Normal behavior? I don't think so or I should say, I hope not!

Thanks.

"Claude Lachapelle" wrote:

> Hi!
>
> We have a big problem with DNS host A records disappearing from their
> zones... everything is configured automatic, so when DHCP give an address,
> the client is registrered into dns automatically, but some of them, are
> disappearing from the zones, even if they are still running (not stale!!!).
>
> We look at TTL on automatically created records, and it is set to 15 min.,
> the default value... when we run ipconfig /registerdns, the record came back,
> and last more thant 15 min., but later during the day, the record is deleted
> from dns... from which process, we really don't know?
>
> Somebody knows why?
>
> Claude Lachapelle
> Systems Administrator, MCSE

Thank you for sharing your experience with us.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
"Claude Lachapelle" <(E-Mail Removed)> wrote in message news:46E3BDD3-ACF2-42A2-82D3-(E-Mail Removed)...
We found it!

On a second server, we are working on a new DHCP server (not yet authorized
in AD), which will be used for split-scope configuration with the first one,
and even if all the imported scopes are deactivated, and the server not
authorized, when we delete a record lease, IT DELETE THE ASSOCIATED HOST A
RECORDS FROM DNS!!!

Normal behavior? I don't think so or I should say, I hope not!

Thanks.

"Claude Lachapelle" wrote:

> Hi!
>
> We have a big problem with DNS host A records disappearing from their
> zones... everything is configured automatic, so when DHCP give an address,
> the client is registrered into dns automatically, but some of them, are
> disappearing from the zones, even if they are still running (not stale!!!).
>
> We look at TTL on automatically created records, and it is set to 15 min.,
> the default value... when we run ipconfig /registerdns, the record came back,
> and last more thant 15 min., but later during the day, the record is deleted
> from dns... from which process, we really don't know?
>
> Somebody knows why?
>
> Claude Lachapelle
> Systems Administrator, MCSE

More... even if we remove the DNS configuration from the unauthorized DHCP
server (dynamic DNS update) , it still delete the A record from DNS when we
delete the lease.

Therefore, we should not export/reimport the dhcp table onto a new dhcp
server when creating a split-scope dhcp environment... except if it exist a
way to exclude leases records from the importation.

Thanks.

"Robert L [MVP - Networking]" wrote:

> Thank you for sharing your experience with us.
>
> Bob Lin, MS-MVP, MCSE & CNE
> Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
> How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
> "Claude Lachapelle" <(E-Mail Removed)> wrote in message news:46E3BDD3-ACF2-42A2-82D3-(E-Mail Removed)...
> We found it!
>
> On a second server, we are working on a new DHCP server (not yet authorized
> in AD), which will be used for split-scope configuration with the first one,
> and even if all the imported scopes are deactivated, and the server not
> authorized, when we delete a record lease, IT DELETE THE ASSOCIATED HOST A
> RECORDS FROM DNS!!!
>
> Normal behavior? I don't think so or I should say, I hope not!
>
> Thanks.
>
> "Claude Lachapelle" wrote:
>
> > Hi!
> >
> > We have a big problem with DNS host A records disappearing from their
> > zones... everything is configured automatic, so when DHCP give an address,
> > the client is registrered into dns automatically, but some of them, are
> > disappearing from the zones, even if they are still running (not stale!!!).
> >
> > We look at TTL on automatically created records, and it is set to 15 min.,
> > the default value... when we run ipconfig /registerdns, the record came back,
> > and last more thant 15 min., but later during the day, the record is deleted
> > from dns... from which process, we really don't know?
> >
> > Somebody knows why?
> >
> > Claude Lachapelle
> > Systems Administrator, MCSE

netsh dhcp server dump was the solution (export to a text file which could be
modified easily).

"Claude Lachapelle" wrote:

> More... even if we remove the DNS configuration from the unauthorized DHCP
> server (dynamic DNS update) , it still delete the A record from DNS when we
> delete the lease.
>
> Therefore, we should not export/reimport the dhcp table onto a new dhcp
> server when creating a split-scope dhcp environment... except if it exist a
> way to exclude leases records from the importation.
>
> Thanks.
>
> "Robert L [MVP - Networking]" wrote:
>
> > Thank you for sharing your experience with us.
> >
> > Bob Lin, MS-MVP, MCSE & CNE
> > Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
> > How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
> > "Claude Lachapelle" <(E-Mail Removed)> wrote in message news:46E3BDD3-ACF2-42A2-82D3-(E-Mail Removed)...
> > We found it!
> >
> > On a second server, we are working on a new DHCP server (not yet authorized
> > in AD), which will be used for split-scope configuration with the first one,
> > and even if all the imported scopes are deactivated, and the server not
> > authorized, when we delete a record lease, IT DELETE THE ASSOCIATED HOST A
> > RECORDS FROM DNS!!!
> >
> > Normal behavior? I don't think so or I should say, I hope not!
> >
> > Thanks.
> >
> > "Claude Lachapelle" wrote:
> >
> > > Hi!
> > >
> > > We have a big problem with DNS host A records disappearing from their
> > > zones... everything is configured automatic, so when DHCP give an address,
> > > the client is registrered into dns automatically, but some of them, are
> > > disappearing from the zones, even if they are still running (not stale!!!).
> > >
> > > We look at TTL on automatically created records, and it is set to 15 min.,
> > > the default value... when we run ipconfig /registerdns, the record came back,
> > > and last more thant 15 min., but later during the day, the record is deleted
> > > from dns... from which process, we really don't know?
> > >
> > > Somebody knows why?
> > >
> > > Claude Lachapelle
> > > Systems Administrator, MCSE