second DHCP server on my 2003 domain

I just added an second DC on my 2003 domain.

In order to achieve redunancy, I would like this additional DC to run DHCP -
in a way that - if the primary DC with DHCP server goes down, the second
takes over.

Now I´m afraid that, if I configure a second DHCP server, that will disrupt
connectivity.

Can anyone explain me how to set up a second dhcp server?

TIA,

/NeXTstep

P.s. I googled around but the hints I found were incomplete.

Best way to do this would be to setup half of your host addresses on one
server and the other half on another. Remeber that DHCP servers do not
communicate with each other.

DHCP SRV01

192.168.0.10 -> 125

DHCP SRV02

192.168.0.126 -> 255

Make sure you keep the options the same on each server the same. The clients
will get an IP address off any server which gives it an address first. Make
sure both servers are authorised and active as well.

Have fun.



"NeXTstep" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>I just added an second DC on my 2003 domain.
>
> In order to achieve redunancy, I would like this additional DC to run
> DHCP - in a way that - if the primary DC with DHCP server goes down, the
> second takes over.
>
> Now I´m afraid that, if I configure a second DHCP server, that will
> disrupt connectivity.
>
> Can anyone explain me how to set up a second dhcp server?
>
> TIA,
>
> /NeXTstep
>
> P.s. I googled around but the hints I found were incomplete.
>
>
>
>
>
>

David,

> Best way to do this would be to setup half of your host addresses on one
> server and the other half on another. Remeber that DHCP servers do not
> communicate with each other.
>
> DHCP SRV01
>
> 192.168.0.10 -> 125
>
> DHCP SRV02
>
> 192.168.0.126 -> 255
>
> Make sure you keep the options the same on each server the same. The
> clients will get an IP address off any server which gives it an address
> first. Make sure both servers are authorised and active as well.
>

Question: let´s say client1 gets a lease from DHCP SRV01. Let´s say that the
same client, after a certain amount of time, requests on the network to
renew the lease, and in this case DHCP SRV02 is faster (by chance) answering
the request. DHCP SRV02 will not find the lease into its database and will
refuse to renew the lease, thus disrupting connection.

Isn´t that right?!? How can I avoid that?

This is my main worry in setting up a second DHCP!!


/NeXTstep

No it will give it an address out of its own scope off addresses. It doesn't
matter if the previous lease came from a different dhcp server. Just make
sure the ip scopes don't overlap and the options are set the same. Usually
though once a computer has got an address from a DHCP server it won't look
for another usless the orginal has gone down for what ever reason.

"NeXTstep" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> David,
>
>> Best way to do this would be to setup half of your host addresses on one
>> server and the other half on another. Remeber that DHCP servers do not
>> communicate with each other.
>>
>> DHCP SRV01
>>
>> 192.168.0.10 -> 125
>>
>> DHCP SRV02
>>
>> 192.168.0.126 -> 255
>>
>> Make sure you keep the options the same on each server the same. The
>> clients will get an IP address off any server which gives it an address
>> first. Make sure both servers are authorised and active as well.
>>
>
> Question: let´s say client1 gets a lease from DHCP SRV01. Let´s say that
> the same client, after a certain amount of time, requests on the network
> to renew the lease, and in this case DHCP SRV02 is faster (by chance)
> answering the request. DHCP SRV02 will not find the lease into its
> database and will refuse to renew the lease, thus disrupting connection.
>
> Isn´t that right?!? How can I avoid that?
>
> This is my main worry in setting up a second DHCP!!
>
>
> /NeXTstep
>

As long as you don't have overlapping scopes you can add it with no
interruptions anytime


"NeXTstep" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>I just added an second DC on my 2003 domain.
>
> In order to achieve redunancy, I would like this additional DC to run
> DHCP - in a way that - if the primary DC with DHCP server goes down, the
> second takes over.
>
> Now I´m afraid that, if I configure a second DHCP server, that will
> disrupt connectivity.
>
> Can anyone explain me how to set up a second dhcp server?
>
> TIA,
>
> /NeXTstep
>
> P.s. I googled around but the hints I found were incomplete.
>
>
>
>
>
>