All of our Windows 2003 computers that are doing dynamic updates of DNS to
the domain controller's DNS server are updating their domain name to resolve
to TWO different IPs. One of these is the IP that is configured for the
host by DHCP. But the second IP is one that is always the same across all
hosts. It is the address 192.38.0.1. Aside from the strangeness of this
being the same address for different computers, what is really strange is
that this IP has no bearing whatsoever to the configuration of our network.
I do not find this IP in the registry of the affected machines, and I do not
find this IP on the file system. Can someone explain to me what might be
causing this? It appears to affect only Windows 2003.

The dynamic updates to our domain controller's DNS server appear to be
accepted with both IPs, but only the correct IP ever gets registered to our
DNS. The 192.38.0.1 address mysteriously vanishes and is never stored by
DNS server, even if I create an Active Directory integrated reverse zone to
hold it (i.e., 192.38.0.x). It seems that this IP 192.38.0.1 is reserved
by Microsoft for some special use, but I'm baffled so far, and I find no
references to it online.

--
Will

In news:ic-dnRdXaYTfwt3YnZ2dnUVZ_q2dnZ2d@giganews.com,
Will <westes-usc@noemail.nospam> stated, which I commented on below:
> All of our Windows 2003 computers that are doing dynamic updates of
> DNS to the domain controller's DNS server are updating their domain
> name to resolve to TWO different IPs. One of these is the IP that
> is configured for the host by DHCP. But the second IP is one that
> is always the same across all hosts. It is the address 192.38.0.1.
> Aside from the strangeness of this being the same address for
> different computers, what is really strange is that this IP has no
> bearing whatsoever to the configuration of our network. I do not find
> this IP in the registry of the affected machines, and I do not find
> this IP on the file system. Can someone explain to me what might
> be causing this? It appears to affect only Windows 2003.
>
> The dynamic updates to our domain controller's DNS server appear to be
> accepted with both IPs, but only the correct IP ever gets registered
> to our DNS. The 192.38.0.1 address mysteriously vanishes and is
> never stored by DNS server, even if I create an Active Directory
> integrated reverse zone to hold it (i.e., 192.38.0.x). It seems
> that this IP 192.38.0.1 is reserved by Microsoft for some special
> use, but I'm baffled so far, and I find no references to it online.

I'm assuming that the domain controllers are single homed (one NIC in use on
one subnet)? But I can't understand why you would have a domain controller
configured for DHCP, unless I mis-read your post and don't know what you
mean by "it is configured for the host by DHCP"?

I looked up 192.38.0.1 using nslookup, however it returns nothing. Arin.net
says it belongs to RIPE, which is based in Amsterdam. So this does not make
sense as to why the DCs are registering this IP. Normally the interface's IP
will get registered into the DNS server that is configured in IP property's
zone, unless there's a mixture with ISP and local DNS servers.

ANy errors in the Event logs?

Can we take a look at an ipconfig /all from the DC that is regsitering this
IP please?

Thanks,

--
Ace
Innovative IT Concepts, Inc (IITCI)
Willow Grove, PA

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft MVP - Directory Services
Microsoft Certified Trainer

Having difficulty reading or finding responses to your post?
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"Ace Fekay [MVP]" <PleaseAskMe@SomeDomain.com> wrote in message
news:eIPP$7C$GHA.1200@TK2MSFTNGP02.phx.gbl...
> In news:ic-dnRdXaYTfwt3YnZ2dnUVZ_q2dnZ2d@giganews.com,
> Will <westes-usc@noemail.nospam> stated, which I commented on below:
> > All of our Windows 2003 computers that are doing dynamic updates of
> > DNS to the domain controller's DNS server are updating their domain
> > name to resolve to TWO different IPs. One of these is the IP that
> > is configured for the host by DHCP. But the second IP is one that
> > is always the same across all hosts. It is the address 192.38.0.1.
> > Aside from the strangeness of this being the same address for
> > different computers, what is really strange is that this IP has no
> > bearing whatsoever to the configuration of our network. I do not find
> > this IP in the registry of the affected machines, and I do not find
> > this IP on the file system. Can someone explain to me what might
> > be causing this? It appears to affect only Windows 2003.
> >
> > The dynamic updates to our domain controller's DNS server appear to be
> > accepted with both IPs, but only the correct IP ever gets registered
> > to our DNS. The 192.38.0.1 address mysteriously vanishes and is
> > never stored by DNS server, even if I create an Active Directory
> > integrated reverse zone to hold it (i.e., 192.38.0.x). It seems
> > that this IP 192.38.0.1 is reserved by Microsoft for some special
> > use, but I'm baffled so far, and I find no references to it online.
>
> I'm assuming that the domain controllers are single homed (one NIC in use
on
> one subnet)? But I can't understand why you would have a domain controller
> configured for DHCP, unless I mis-read your post and don't know what you
> mean by "it is configured for the host by DHCP"?

The domain controller is single homed and has a static IP. The DHCP hosts
are the Windows 2003 server member servers.

It is the Windows 2003 member servers that are exhibiting this weird
behavior of trying to register 192.38.0.1.


> I looked up 192.38.0.1 using nslookup, however it returns nothing.
Arin.net
> says it belongs to RIPE, which is based in Amsterdam. So this does not
make
> sense as to why the DCs are registering this IP. Normally the interface's
IP
> will get registered into the DNS server that is configured in IP
property's
> zone, unless there's a mixture with ISP and local DNS servers.

Again, it's not the domain controllers that are registering this IP. It is
all of our Windows 2003 member servers.


> ANy errors in the Event logs?

None that I can find anyway.

--
Will

Will wrote:
<snip>
> The dynamic updates to our domain controller's DNS server appear to be
> accepted with both IPs, but only the correct IP ever gets registered
> to our DNS. The 192.38.0.1 address mysteriously vanishes and is
> never stored by DNS server, even if I create an Active Directory
> integrated reverse zone to hold it (i.e., 192.38.0.x). It seems
> that this IP 192.38.0.1 is reserved by Microsoft for some special
> use, but I'm baffled so far, and I find no references to it online.

Is this an A or a PTR record?

About this statement:
"The 192.38.0.1 address mysteriously vanishes and is never stored by DNS
server"

Is it coming up in the cache?

I would like to see an unedited ipconfig /all from one of these machines to
see if I can replicate this.


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