Updates between Cisco Router DHCP and Windows DNS

[Dragon]

Hi,

I would like to find out if it is possible to have dynamic updates between a
Cisco Router's DHCP server and Windows Server 2003's DNS server.

Here is the scenario:

- Remote locations with (custom) IP devices (We will call them DevX)
- These devices request IP address from DHCP which is then provided by local
Cisco Router
- Cisco Router provides IP address and DNS address list.
- DevX is not capable of registering itself with DNS Server
- DevX does register its name with DHCP server when getting an IP.

Is it possible for Cisco DHCP Server to send these registrations to a DNS
Server on a remote Windows Server?

Thank you.

[Anthony [MVP]]

Dragon,
No, it is not.
With a Windows DNS Server, the client "registers" by writing its address
into the DNS file. With a Cisco DHCP, the client does not "register"
anything. The DHCP server assigns an address to the client, and stores the
information.
You would need to have a process that reads the router config, obtains the
DHCP information and then writes it to the DNS Server. The router itself has
no mechanism to do this.

On the other hand, you could use a remote Windows DHCP server, by setting
the router to forward the DHCP requests. Then you could have the Windows
DHCP server register the clients in Windows DNS.

The disadvantage is that the DevX clients are then dependent on the WAN for
their address assignment. That could be OK depending on the stability of the
WAN link.

Hope that helps,
Anthony
http://www.airdesk.com



"Dragon" <nospam_baadil@hotmail.com> wrote in message
news:uwF748s0JHA.3476@TK2MSFTNGP05.phx.gbl...
> Hi,
>
> I would like to find out if it is possible to have dynamic updates between
> a Cisco Router's DHCP server and Windows Server 2003's DNS server.
>
> Here is the scenario:
>
> - Remote locations with (custom) IP devices (We will call them DevX)
> - These devices request IP address from DHCP which is then provided by
> local Cisco Router
> - Cisco Router provides IP address and DNS address list.
> - DevX is not capable of registering itself with DNS Server
> - DevX does register its name with DHCP server when getting an IP.
>
> Is it possible for Cisco DHCP Server to send these registrations to a DNS
> Server on a remote Windows Server?
>
> Thank you.
>

[Dragon]

Thank you Anthony.

If at all possible I rather not do DHCP over WAN as I will have no control
over the WAN connecitvity and it might be sketchy at best. Do you know of
any DHCP server software that will run on Windows XP Pro and forward
information to Windows DNS Server on a remote location? DevX is not capable
of registering itself with DNS but I do have a Windows XP device at each
remote location. If I can run some simple DHCP server on this XP machine and
then somehow have it forward it's information to the DNS server, this might
resolve my issue.



"Anthony [MVP]" <anthony@no-reply.com> wrote in message
news:eZZgcDu0JHA.4468@TK2MSFTNGP05.phx.gbl...
> Dragon,
> No, it is not.
> With a Windows DNS Server, the client "registers" by writing its address
> into the DNS file. With a Cisco DHCP, the client does not "register"
> anything. The DHCP server assigns an address to the client, and stores the
> information.
> You would need to have a process that reads the router config, obtains the
> DHCP information and then writes it to the DNS Server. The router itself
> has no mechanism to do this.
>
> On the other hand, you could use a remote Windows DHCP server, by setting
> the router to forward the DHCP requests. Then you could have the Windows
> DHCP server register the clients in Windows DNS.
>
> The disadvantage is that the DevX clients are then dependent on the WAN
> for their address assignment. That could be OK depending on the stability
> of the WAN link.
>
> Hope that helps,
> Anthony
> http://www.airdesk.com
>
>
>
> "Dragon" <nospam_baadil@hotmail.com> wrote in message
> news:uwF748s0JHA.3476@TK2MSFTNGP05.phx.gbl...
>> Hi,
>>
>> I would like to find out if it is possible to have dynamic updates
>> between a Cisco Router's DHCP server and Windows Server 2003's DNS
>> server.
>>
>> Here is the scenario:
>>
>> - Remote locations with (custom) IP devices (We will call them DevX)
>> - These devices request IP address from DHCP which is then provided by
>> local Cisco Router
>> - Cisco Router provides IP address and DNS address list.
>> - DevX is not capable of registering itself with DNS Server
>> - DevX does register its name with DHCP server when getting an IP.
>>
>> Is it possible for Cisco DHCP Server to send these registrations to a DNS
>> Server on a remote Windows Server?
>>
>> Thank you.
>>

[Grant Taylor]

On 5/12/2009 5:45 AM, Dragon wrote:
> If I can run some simple DHCP server on this XP machine and then
> somehow have it forward it's information to the DNS server, this
> might resolve my issue.

You might look in to running a VM appliance that is running ISC's DHCP
server as it can do dynamic DNS registration requests on behalf of
clients even if they don't ask for it to happen.



Grant. . . .

[Anthony [MVP]]

You could go down the route of a third party dhcp server on XP.
Or you could assign each DevX client a reserved address and then just put
those in the DNS yourself.
Hope that helps,
Anthony
http://www.airdesk.com


"Dragon" <nospam_baadil@hotmail.com> wrote in message
news:eTqeJ7u0JHA.4716@TK2MSFTNGP02.phx.gbl...
> Thank you Anthony.
>
> If at all possible I rather not do DHCP over WAN as I will have no control
> over the WAN connecitvity and it might be sketchy at best. Do you know of
> any DHCP server software that will run on Windows XP Pro and forward
> information to Windows DNS Server on a remote location? DevX is not
> capable of registering itself with DNS but I do have a Windows XP device
> at each remote location. If I can run some simple DHCP server on this XP
> machine and then somehow have it forward it's information to the DNS
> server, this might resolve my issue.
>
>
>
> "Anthony [MVP]" <anthony@no-reply.com> wrote in message
> news:eZZgcDu0JHA.4468@TK2MSFTNGP05.phx.gbl...
>> Dragon,
>> No, it is not.
>> With a Windows DNS Server, the client "registers" by writing its address
>> into the DNS file. With a Cisco DHCP, the client does not "register"
>> anything. The DHCP server assigns an address to the client, and stores
>> the information.
>> You would need to have a process that reads the router config, obtains
>> the DHCP information and then writes it to the DNS Server. The router
>> itself has no mechanism to do this.
>>
>> On the other hand, you could use a remote Windows DHCP server, by setting
>> the router to forward the DHCP requests. Then you could have the Windows
>> DHCP server register the clients in Windows DNS.
>>
>> The disadvantage is that the DevX clients are then dependent on the WAN
>> for their address assignment. That could be OK depending on the stability
>> of the WAN link.
>>
>> Hope that helps,
>> Anthony
>> http://www.airdesk.com
>>
>>
>>
>> "Dragon" <nospam_baadil@hotmail.com> wrote in message
>> news:uwF748s0JHA.3476@TK2MSFTNGP05.phx.gbl...
>>> Hi,
>>>
>>> I would like to find out if it is possible to have dynamic updates
>>> between a Cisco Router's DHCP server and Windows Server 2003's DNS
>>> server.
>>>
>>> Here is the scenario:
>>>
>>> - Remote locations with (custom) IP devices (We will call them DevX)
>>> - These devices request IP address from DHCP which is then provided by
>>> local Cisco Router
>>> - Cisco Router provides IP address and DNS address list.
>>> - DevX is not capable of registering itself with DNS Server
>>> - DevX does register its name with DHCP server when getting an IP.
>>>
>>> Is it possible for Cisco DHCP Server to send these registrations to a
>>> DNS Server on a remote Windows Server?
>>>
>>> Thank you.
>>>
>
>

[Jonathan de Boyne Pollard]

I would like to find out if it is possible to have dynamic updates between a Cisco Router's DHCP server and Windows Server 2003's DNS server.



Is it possible for Cisco DHCP Server to send these registrations to a DNS Server on a remote Windows Server?



No, it is not.



With a Windows DNS Server, the client "registers" by writing its address into the DNS file. With a Cisco DHCP, the client does not "register" anything. The DHCP server assigns an address to the client, and stores the information.



You would need to have a process that reads the router config, obtains the DHCP information and then writes it to the DNS Server. The router itself has no mechanism to do this.



No-one has commented on this in the intervening months.&nbsp; For the benefit of Google Groups and others: A Cisco IOS DHCP server is quite capable of sending Dynamic DNS Updates to a DNS server.&nbsp; The version 12.3 and later documentation includes a guide to Dynamic DNS Support that has step-by-step guides.