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Active Directory Integrated DNS-DHCP -> DHCP computers with Pen Ic

Windows Server Help


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  #1  
Old 13-04-2009
Kashif
 
Posts: n/a
Active Directory Integrated DNS-DHCP -> DHCP computers with Pen Ic

I have computer that gets DHCP lease with Pen ICON.
According to Technet:
http://technet.microsoft.com/en-us/l.../cc784812.aspx
Active Lease, DNS dynamic update pending. This address is not available for
lease by the DHCP server.

DHCP properties:

DNS TAB
-----------
Checked -> Enable DNS dynamic updates according to the settings below
Radio Button enable -> Dynamically update DNS A and PTR records only if
requested by the DHCP client.

Checked -> Discard A and PTR records when lease is deleted

General TAB
-------------
Checked - > Enable DHCP audit logging

Lease duration for DHCP clients:
------------------------------------
1 Days 0 Hours and 0 minutes

Scope Options:
-----------------
003 Router configured for Firewall LAN IP address
006 DNS Servers configured for DC1 and DC2 IP address
015 DNS Domain Name configured MyDomain.com

Thank you for all the HELP!!!


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  #2  
Old 14-04-2009
Ace Fekay [Microsoft Certified Trainer]
 
Posts: n/a
Re: Active Directory Integrated DNS-DHCP -> DHCP computers with Pen Ic

In news:FE929CD9-E492-4E71-81AA-CA03E0695F5F@microsoft.com,
Kashif <Kashif@discussions.microsoft.com>, seeking assistance, posted the
following:
> I have computer that gets DHCP lease with Pen ICON.
> According to Technet:
> http://technet.microsoft.com/en-us/l.../cc784812.aspx
> Active Lease, DNS dynamic update pending. This address is not
> available for lease by the DHCP server.
>
> DHCP properties:
>
> DNS TAB
> -----------
> Checked -> Enable DNS dynamic updates according to the settings below
> Radio Button enable -> Dynamically update DNS A and PTR records only
> if requested by the DHCP client.
>
> Checked -> Discard A and PTR records when lease is deleted
>
> General TAB
> -------------
> Checked - > Enable DHCP audit logging
>
> Lease duration for DHCP clients:
> ------------------------------------
> 1 Days 0 Hours and 0 minutes
>
> Scope Options:
> -----------------
> 003 Router configured for Firewall LAN IP address
> 006 DNS Servers configured for DC1 and DC2 IP address
> 015 DNS Domain Name configured MyDomain.com
>
> Thank you for all the HELP!!!


Take a read on the following link. Click on the DHCP Icon references It
means that a DNS update is pending.

DHCP Tech Reference:
http://technet.microsoft.com/en-us/l.../cc781580.aspx

It may mean that if it is stuck on the pencil icon, it means it cannot
update the record in DNS because it already exists and DHCP server does not
own the record, the client machine does, and therefore the DHCP server
cannot update the record. One way to get around that is to force DHCP to own
the record, but there are few steps you need to perform to enable this
feature, as well as set scavenging options. Read the following for a how-to.

==================================================================================================== ==
==================================================================================================== ==


DHCP, Dynamice DNS Updates , Scavenging, static entries & timestamps, and
the DnsProxyUpdate Group:


--------------------------------------------
The entity that registers it owns the record. The nice thing about DHCP
owning the record is it will update it if DHCP gives the machine a new IP.
Otherwise you'll see multiples of the same in DNS whether scavenging is
enabled or not. I would force DHCP to own the record as well as enable
scavenging to keep it clean. To force DHCP to own the record, you will need
to do the following:

1. Add the DHCP server to the DnsUpdateProxy Group.
2. Force DHCP to register all records, Forward and PTR, (whether a client
machine can do it or not) in the Option 081 tab (DHCP properties, DNS tab).
3. Set Option 015 to the AD domain name (such as example.com).
4. Set Option 006 to only the internal DNS servers.
5. If the zone is set for Secure Updates Only, then DHCP cannot update
non-Microsoft clients and Microsoft clients that are not joined to the
domain. In this case, you will need to create and configure a user account
for use as credentials for DHCP to register such clients.
If your DHCP servers are Windows 2003 or WIndows 2008, Configure a
dedicated the user account you created as credentials in DHCP by going into
DHCP COnsole, DHCP server properties, and on the Advanced tab of the DHCP
Server
Properties sheet click the Credentials button, and provide this account
info.
The user account does not need any elevated rights, a normal user account
is fine, however I recommend using a Strong non-expiring password on the
account.

Once you implement scavenging, you will need to wait at least a week for it
to
take effect. You can quicken it up by manually deleting the incorrect
records to
get started.

But more importantly, if DHCP is on a DC, it will not overwrite the
original host record for a machine getting a new lease with an IP
formerly belonging to another. To overcome this, add the DHCP server
(the DC) to the DnsProxyUpdate group. This will force DHCP to own
all records it will create moving forward and will update an IP with
a new name in DNS.

If you set this, but when a record shows up in the DHCP Lease list with a
pen
(which means that a write is pending), it m ay mean it is trying to register
into a zone that does not exist on the DNS servers. This happens in cases
where
the client machine is not joined to the domain and has a missing or
different
suffix than the zone in DNS. It can only register into a zone that exists on
DNS and that zone updates have been configured to allow updates.
If this is the case, go into the client machine's IP properties, and
on the DNS tab in TCP/IP properties, clear the "Register this connection's
addresses in DNS" as well as the "Use this connection's DNS suffix in DNS
registration"
check boxes, the DHCP Server will fill these in for you and register using
the domain name in Option 015.

Concerning records and timestamps, and lack of timestamps:

If the record was manually created, it won't show a time stamp, however, if
the record was dynamically registered, it will show a time stamp. My guess
is the records you are referring to were manually created. If you manually
create a record, the checkbox will not be checked to scavenge, however if it
was dynamically registered, it will be checked. I just tested this
withWindows 2003 DNS. When I had built a few servers for a customer and let
them auto register, they had a timestamp and the scavenge checkbox was
checked. For the records I manually created, such as internal www records,
and others, they did not have a time stamp and were not checked to scavenge.

Even if you allow auto registration, which I do by default, and it gets
scavenged, it gets re-registered anyway by the OS. Unless you are seeing
something going on that is affecting your environment, the default settings
work fine, at least they do for me for all of my customers and installations
I've worked in that I've set scavenging and forced DHCP to own the records
so it can update the records it had registered at lease refresh time.


The following links provide additional information on how it all works.

How to configure DNS dynamic updates in Windows Server 2003.
http://support.microsoft.com/kb/816592

Using DNS Aging and ScavengingAging and scavenging of stale resource records
are features of Domain Name System (DNS) that are available when you deploy
your server with primary zones.
http://technet.microsoft.com/en-us/l.../cc757041.aspx

Microsoft Enterprise Networking Team : Don't be afraid of DNS ...Mar 19,
2008 ... DNS Scavenging is a great answer to a problem that has been nagging
everyone since RFC 2136 came out way back in 1997.
http://blogs.technet.com/networking/...e-patient.aspx

DHCP, DNS and the DNSUpdateProxy-Group - Directory Services/Active ...I had
a discussion in the Newsgroups lately about DHCP and the
DNSUpdateProxy-Group which is used to write unsecured DNS-Entries to a
DNS-Zone which only ...
http://msmvps.com/ulfbsimonweidner/a.../15/19325.aspx

And from Kevin Goodnecht:
Setting up DHCP for DNS registrations
http://support.wftx.us/setting_up_dh...s_registra.htm

317590 - HOW TO Configure DNS Dynamic Update in Windows 2000 and
DNSUpdateProxy Group:
http://support.microsoft.com/?id=317590

816592 - How to configure DNS dynamic updates in Windows Server 2003:
http://support.microsoft.com/kb/816592/

Follow up discussion on the DNSUpdateProxy-Group:
http://msmvps.com/ulfbsimonweidner/a.../26/39841.aspx

==================================================================================================== ==
==================================================================================================== ==

--
Ace

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

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSA Messaging, MCT
Microsoft Certified Trainer
aceman@mvps.RemoveThisPart.org

For urgent issues, you may want to contact Microsoft PSS directly. Please
check http://support.microsoft.com for regional support phone numbers.

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