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Home » Microsoft » Windows Server » Active Directory » Second DHCP server seems to be ignoring requests
Second DHCP server seems to be ignoring requests [message #301353] Wed, 28 October 2009 15:47 Go to next message
tdnnash25  is currently offline tdnnash25  United States
Messages: 8
Registered: October 2009
Junior Member
I have a Domain Controller that is doing DHCP but we are going to be
taking it down. Thus, I am tasked with getting DHCP, DNS, etc
configured on Server2.

Server 2 is a domain controller. I used netsh to export the DHCP
database from Server1 and likewise used it to import the database on
Server2. I then authorized Server2 as a DHCP server.

The problem is when I stop the DHCP service on Server1 and attempt to
get a DHCP address on a client PC, I don't get one. As soon as I
restart the DHCP service on Server 1, I do. I ran Wireshark on
Server2 and it sees the DHCP broadcasts coming in, but nothing
happens.

Can anyone share some suggestions?
Re: Second DHCP server seems to be ignoring requests [message #301354 is a reply to message #301353] Wed, 28 October 2009 15:54 Go to previous messageGo to next message
KevinJ.SBS  is currently offline KevinJ.SBS  United States
Messages: 653
Registered: July 2009
Senior Member
Not really DS related, but did you also activate the new scope?

tdnnash25 wrote:
> I have a Domain Controller that is doing DHCP but we are going to be
> taking it down. Thus, I am tasked with getting DHCP, DNS, etc
> configured on Server2.
>
> Server 2 is a domain controller. I used netsh to export the DHCP
> database from Server1 and likewise used it to import the database on
> Server2. I then authorized Server2 as a DHCP server.
>
> The problem is when I stop the DHCP service on Server1 and attempt to
> get a DHCP address on a client PC, I don't get one. As soon as I
> restart the DHCP service on Server 1, I do. I ran Wireshark on
> Server2 and it sees the DHCP broadcasts coming in, but nothing
> happens.
>
> Can anyone share some suggestions?

--
/kj
Re: Second DHCP server seems to be ignoring requests [message #301362 is a reply to message #301354] Wed, 28 October 2009 15:58 Go to previous messageGo to next message
tdnnash25  is currently offline tdnnash25  United States
Messages: 8
Registered: October 2009
Junior Member
I didn't manually activate them, but they are activated. Somehow the
import using netsh must have done that. Anyhow, if you right click on
the scopes you only have the option to Deactivate.
Re: Second DHCP server seems to be ignoring requests [message #301410 is a reply to message #301362] Wed, 28 October 2009 16:52 Go to previous messageGo to next message
Marcin  is currently offline Marcin  United States
Messages: 273
Registered: July 2009
Senior Member
Check the server bindings - make sure they point to the correct network
connection/IP address...

hth
Marcin

"tdnnash25" <tdnnash25@gmail.com> wrote in message
news:b2005a45-1766-4535-914e-df2cf8afaf00@j19g2000yqk.googlegroups.com...
>I didn't manually activate them, but they are activated. Somehow the
> import using netsh must have done that. Anyhow, if you right click on
> the scopes you only have the option to Deactivate.
Re: Second DHCP server seems to be ignoring requests [message #301433 is a reply to message #301410] Wed, 28 October 2009 17:09 Go to previous messageGo to next message
southpaw  is currently offline southpaw  United States
Messages: 61
Registered: July 2009
Member
Verify the old dhcp is unauthorized and the new dhcp is authorized...


"Marcin" <marcin@community.nospam> wrote in message
news:e#4NoFCWKHA.4416@TK2MSFTNGP02.phx.gbl...
> Check the server bindings - make sure they point to the correct network
> connection/IP address...
>
> hth
> Marcin
>
> "tdnnash25" <tdnnash25@gmail.com> wrote in message
> news:b2005a45-1766-4535-914e-df2cf8afaf00@j19g2000yqk.googlegroups.com...
>>I didn't manually activate them, but they are activated. Somehow the
>> import using netsh must have done that. Anyhow, if you right click on
>> the scopes you only have the option to Deactivate.
>
>
Re: Second DHCP server seems to be ignoring requests [message #301559 is a reply to message #301353] Wed, 28 October 2009 21:06 Go to previous messageGo to next message
aceman  is currently offline aceman  United States
Messages: 5816
Registered: July 2009
Senior Member
"tdnnash25" <tdnnash25@gmail.com> wrote in message
news:37731dcb-32a4-4277-987e-19f6d2205a20@t2g2000yqn.googlegroups.com...
>I have a Domain Controller that is doing DHCP but we are going to be
> taking it down. Thus, I am tasked with getting DHCP, DNS, etc
> configured on Server2.
>
> Server 2 is a domain controller. I used netsh to export the DHCP
> database from Server1 and likewise used it to import the database on
> Server2. I then authorized Server2 as a DHCP server.
>
> The problem is when I stop the DHCP service on Server1 and attempt to
> get a DHCP address on a client PC, I don't get one. As soon as I
> restart the DHCP service on Server 1, I do. I ran Wireshark on
> Server2 and it sees the DHCP broadcasts coming in, but nothing
> happens.
>
> Can anyone share some suggestions?


You also posted this question in the General newsgroup. In the future, it is
to YOUR advantage to cross-post to multiple newsgroups, not multi-post.
Cross-posting allows responders from both groups to collaborate to better
help you, and all responses go to both groups, which you will only have to
check one of the groups for all responses.

Ace
Re: Second DHCP server seems to be ignoring requests [message #301602 is a reply to message #301410] Wed, 28 October 2009 21:57 Go to previous messageGo to next message
tdnnash25  is currently offline tdnnash25  United States
Messages: 8
Registered: October 2009
Junior Member
Bindings are good
Re: Second DHCP server seems to be ignoring requests [message #301603 is a reply to message #301433] Wed, 28 October 2009 21:57 Go to previous messageGo to next message
tdnnash25  is currently offline tdnnash25  United States
Messages: 8
Registered: October 2009
Junior Member
I wondered if the old had to be unauthorized or not, but never
unauthorized it. So, it really has to be unauthorized before the new
one, which is already authorized, to work?
Re: Second DHCP server seems to be ignoring requests [message #301694 is a reply to message #301353] Thu, 29 October 2009 01:13 Go to previous messageGo to next message
Meinolf Weber MVP-DS  is currently offline Meinolf Weber MVP-DS  Germany
Messages: 129
Registered: July 2009
Senior Member
Hello tdnnash25,

Make sure the new DHCP server is authorized in AD. In the DHCP management
console rightclick DHCP, choose "Manage authorized servers" and see if the
new one is listed.

Which OS version are you talking about?

Any firewall running on the new server?

You can run multiple DHCP servers without any problem. Just make sure they
don't offer the same range of the scope to the clients.

Best regards

Meinolf Weber
Disclaimer: This posting is provided "AS IS" with no warranties, and confers
no rights.
** Please do NOT email, only reply to Newsgroups
** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm


> I have a Domain Controller that is doing DHCP but we are going to be
> taking it down. Thus, I am tasked with getting DHCP, DNS, etc
> configured on Server2.
>
> Server 2 is a domain controller. I used netsh to export the DHCP
> database from Server1 and likewise used it to import the database on
> Server2. I then authorized Server2 as a DHCP server.
>
> The problem is when I stop the DHCP service on Server1 and attempt to
> get a DHCP address on a client PC, I don't get one. As soon as I
> restart the DHCP service on Server 1, I do. I ran Wireshark on
> Server2 and it sees the DHCP broadcasts coming in, but nothing
> happens.
>
> Can anyone share some suggestions?
>
Re: Second DHCP server seems to be ignoring requests [message #301850 is a reply to message #301353] Thu, 29 October 2009 06:27 Go to previous messageGo to next message
pbbergs  is currently offline pbbergs  United States
Messages: 1024
Registered: July 2009
Senior Member
I would suspect it is either the fact the DHCP server hasn't been authorized
yet in AD -or- the clients aren't on the same subnet as the DHCP server and
a dhcp helper (Relay on a router) on the remote subnets hasn't been
configured.

--
Paul Bergson
MVP - Directory Services
MCTS, MCT, MCSE, MCSA, Security+, BS CSci
2008, 2003, 2000 (Early Achiever), NT4
Microsoft's Thrive IT Pro of the Month - June 2009

http://www.pbbergs.com

Please no e-mails, any questions should be posted in the NewsGroup This
posting is provided "AS IS" with no warranties, and confers no rights.

"tdnnash25" <tdnnash25@gmail.com> wrote in message
news:37731dcb-32a4-4277-987e-19f6d2205a20@t2g2000yqn.googlegroups.com...
>I have a Domain Controller that is doing DHCP but we are going to be
> taking it down. Thus, I am tasked with getting DHCP, DNS, etc
> configured on Server2.
>
> Server 2 is a domain controller. I used netsh to export the DHCP
> database from Server1 and likewise used it to import the database on
> Server2. I then authorized Server2 as a DHCP server.
>
> The problem is when I stop the DHCP service on Server1 and attempt to
> get a DHCP address on a client PC, I don't get one. As soon as I
> restart the DHCP service on Server 1, I do. I ran Wireshark on
> Server2 and it sees the DHCP broadcasts coming in, but nothing
> happens.
>
> Can anyone share some suggestions?
Re: Second DHCP server seems to be ignoring requests [message #302048 is a reply to message #301694] Thu, 29 October 2009 09:28 Go to previous messageGo to next message
tdnnash25  is currently offline tdnnash25  United States
Messages: 8
Registered: October 2009
Junior Member
Meinolf,

It is listed in authorized servers, had already checked that. Server
2003, no firewall running on it.
Re: Second DHCP server seems to be ignoring requests [message #302049 is a reply to message #301850] Thu, 29 October 2009 09:30 Go to previous messageGo to next message
tdnnash25  is currently offline tdnnash25  United States
Messages: 8
Registered: October 2009
Junior Member
On Oct 29, 7:27 am, "Paul Bergson [MVP-DS]" <pbbergs@no_spammsn.com>
wrote:
> I would suspect it is either the fact the DHCP server hasn't been authorized
> yet in AD -or- the clients aren't on the same subnet as the DHCP server and
> a dhcp helper (Relay on a router) on the remote subnets hasn't been
> configured.
>

It has been authorized in AD. The clients I'm testing with are on a
different subnet in a VM. But, the primary DHCP server is on the same
subnet as the secondary DHCP server (10.10.11.x). I am not sure about
a Relay though.
Re: Second DHCP server seems to be ignoring requests [message #302104 is a reply to message #302049] Thu, 29 October 2009 10:19 Go to previous messageGo to next message
pbbergs  is currently offline pbbergs  United States
Messages: 1024
Registered: July 2009
Senior Member
Here some backgroup on a relay agent. This can/should be first configured
on a router if possible.

http://www.tech-faq.com/dhcp-relay-agent.shtml

--
Paul Bergson
MVP - Directory Services
MCTS, MCT, MCSE, MCSA, Security+, BS CSci
2008, 2003, 2000 (Early Achiever), NT4
Microsoft's Thrive IT Pro of the Month - June 2009

http://www.pbbergs.com

Please no e-mails, any questions should be posted in the NewsGroup This
posting is provided "AS IS" with no warranties, and confers no rights.

"tdnnash25" <tdnnash25@gmail.com> wrote in message
news:794325db-5212-47a3-9310-aa63d6078f33@j4g2000yqe.googlegroups.com...
On Oct 29, 7:27 am, "Paul Bergson [MVP-DS]" <pbbergs@no_spammsn.com>
wrote:
> I would suspect it is either the fact the DHCP server hasn't been
> authorized
> yet in AD -or- the clients aren't on the same subnet as the DHCP server
> and
> a dhcp helper (Relay on a router) on the remote subnets hasn't been
> configured.
>

It has been authorized in AD. The clients I'm testing with are on a
different subnet in a VM. But, the primary DHCP server is on the same
subnet as the secondary DHCP server (10.10.11.x). I am not sure about
a Relay though.
Re: Second DHCP server seems to be ignoring requests [message #302138 is a reply to message #302049] Thu, 29 October 2009 10:46 Go to previous messageGo to next message
aceman  is currently offline aceman  United States
Messages: 5816
Registered: July 2009
Senior Member
> On Oct 29, 7:27 am, "Paul Bergson [MVP-DS]" <pbbergs@no_spammsn.com>
> wrote:
>> I would suspect it is either the fact the DHCP server hasn't been authorized
>> yet in AD -or- the clients aren't on the same subnet as the DHCP server and
>> a dhcp helper (Relay on a router) on the remote subnets hasn't been
>> configured.
>>
>
> It has been authorized in AD. The clients I'm testing with are on a
> different subnet in a VM. But, the primary DHCP server is on the same
> subnet as the secondary DHCP server (10.10.11.x). I am not sure about
> a Relay though.

If the clients are on a different subnet, then I assume that the DHCP
scope is set to an IP range for the subnet the clients are sitting on,
and the DHCP server is either directly connected to that subnet
(meaning the interface of the DHCP server has an IP on that subnet), or
there is a DHCP Relay agent to receive/transmit DHCP requests from that
subnet to the DHCP server on a different subnet.

DHCP will only work if one of the interfaces are configured with a
configuration with an IP address in the same subnet as the scope but
not within the scope. Otherwise, if the clients are on a subnet the
DHCP server is not connected to, then you must use some sort of DHCP
relay agent or IP helper.

Ace

--
Ace

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

Please reply back to the newsgroup or forum for collaboration benefit
among responding engineers, and to help others benefit from your
resolution.

Ace Fekay, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE &
MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer

For urgent issues, please contact Microsoft PSS directly. Please check
http://support.microsoft.com for regional support phone numbers.
Re: Second DHCP server seems to be ignoring requests [message #302156 is a reply to message #302048] Thu, 29 October 2009 10:58 Go to previous messageGo to next message
meiweb  is currently offline meiweb  Germany
Messages: 2225
Registered: September 2009
Senior Member
Hello tdnnash25,

Please post an unedited ipconfig /all from both servers. Also post the scope
options and the scope range.

Best regards

Meinolf Weber
Disclaimer: This posting is provided "AS IS" with no warranties, and confers
no rights.
** Please do NOT email, only reply to Newsgroups
** HELP us help YOU!!! http://www.blakjak.demon.co.uk/mul_crss.htm


> Meinolf,
>
> It is listed in authorized servers, had already checked that. Server
> 2003, no firewall running on it.
>
Re: Second DHCP server seems to be ignoring requests [message #303564 is a reply to message #302138] Fri, 30 October 2009 15:14 Go to previous message
Sawyer  is currently offline Sawyer
Messages: 315
Registered: July 2009
Senior Member
Do you have network teaming configured on the DHCP server? I had a similar
problem and it ended being the teaming of the nic's on the DHCP server that
was preventing the DHCP server from handing out ip's to the client machines

"Ace Fekay [MCT]" <aceman@mvps.RemoveThisPart.org> wrote in message
news:mn.eafe7d9a05ba5583.105663@mvps.RemoveThisPart.org...
>> On Oct 29, 7:27 am, "Paul Bergson [MVP-DS]" <pbbergs@no_spammsn.com>
>> wrote:
>>> I would suspect it is either the fact the DHCP server hasn't been
>>> authorized
>>> yet in AD -or- the clients aren't on the same subnet as the DHCP server
>>> and
>>> a dhcp helper (Relay on a router) on the remote subnets hasn't been
>>> configured.
>>>
>>
>> It has been authorized in AD. The clients I'm testing with are on a
>> different subnet in a VM. But, the primary DHCP server is on the same
>> subnet as the secondary DHCP server (10.10.11.x). I am not sure about
>> a Relay though.
>
> If the clients are on a different subnet, then I assume that the DHCP
> scope is set to an IP range for the subnet the clients are sitting on, and
> the DHCP server is either directly connected to that subnet (meaning the
> interface of the DHCP server has an IP on that subnet), or there is a DHCP
> Relay agent to receive/transmit DHCP requests from that subnet to the DHCP
> server on a different subnet.
>
> DHCP will only work if one of the interfaces are configured with a
> configuration with an IP address in the same subnet as the scope but not
> within the scope. Otherwise, if the clients are on a subnet the DHCP
> server is not connected to, then you must use some sort of DHCP relay
> agent or IP helper.
>
> Ace
>
> --
> Ace
>
> This posting is provided "AS-IS" with no warranties or guarantees and
> confers no rights.
>
> Please reply back to the newsgroup or forum for collaboration benefit
> among responding engineers, and to help others benefit from your
> resolution.
>
> Ace Fekay, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE & MCSA
> 2003/2000, MCSA Messaging 2003
> Microsoft Certified Trainer
>
> For urgent issues, please contact Microsoft PSS directly. Please check
> http://support.microsoft.com for regional support phone numbers.
>
>
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