DHCP problems

  • Thread starter Thread starter Barry
  • Start date Start date
B

Barry

Guest
Hi all,

I have 2 seperate domains connecting to the one DHCP server through
the same VLAN.

Each Domain has its own DNS server, How can I tell the DHCP Server to
hand out DNS Address to domain A and another to Domain B? as each
domain has its own DNS server.

At the moment all its doing its handing out the 2 domains with the
same DNS, IP etc defined in the scope.

Is there any way of telling the DHCP server that if a client comes
from domain A hand out this DNS addresses and if comming from Domain B
give it this DNS addresses?

cheers

barry
 
Re: DHCP problems

Hello,

Do you have a trust between both domain ?
Since windows 2000, DHCP should only update the PTR, workstation are now
updating their IN A record themselves.

Using DNS servers with DHCP
http://technet2.microsoft.com/windo...c368-46c2-b017-caf25ae150ec1033.mspx?mfr=true


--
Cordialement,
Mathieu CHATEAU
http://lordoftheping.blogspot.com


"Barry" <b.clyde@wintoncapital.com> wrote in message
news:1189695147.275563.194680@g4g2000hsf.googlegroups.com...
> Hi all,
>
> I have 2 seperate domains connecting to the one DHCP server through
> the same VLAN.
>
> Each Domain has its own DNS server, How can I tell the DHCP Server to
> hand out DNS Address to domain A and another to Domain B? as each
> domain has its own DNS server.
>
> At the moment all its doing its handing out the 2 domains with the
> same DNS, IP etc defined in the scope.
>
> Is there any way of telling the DHCP server that if a client comes
> from domain A hand out this DNS addresses and if comming from Domain B
> give it this DNS addresses?
>
> cheers
>
> barry
>
 
RE: DHCP problems

Hi Barry,

DHCP servers work through broadcasts. When a workstation needs a new
address, it sends out a server request and whatever DHCP server responds
first (on the broadcast domain or through IP Helper-address) wins.
Unfortunately, DHCP is not aware of things like domains and will give an
address to anything that requests it. In a windows domain the DHCP server
can do a lot of things on the Domain's behalf -- like register DNS -- but
this is as part of it handing out the address rather than before it has made
the connection.

You have a few options though, but none of them are easy or simple.

1. Create new subnets --- this would segment your DHCP traffic and allow you
to ensure that the DHCP server for each domain can only service its own
clients. You would use VLANs to segment these by port assignment.

2. User 802.1x to control DHCP authentication based on machine certificate
via EAP. This is a complicated solution, but it is secure and would
authenticate the machines before they has IP addresses.

3. Create machines classes in DHCP and create DHCP scopes on these classes
on ONE DHCP server and allow the workstations to do their own DNS
registration.

4. Hardcode all your IP addresses/

I think those are the only real options you've got. I'd personally go with
option #1.
--
Ryan Hanisco
MCSE, MCTS: SQL 2005, Project+
www.techsterity.com
Chicago, IL

Remember: Marking helpful answers helps everyone find the info they need
quickly.


"Barry" wrote:

> Hi all,
>
> I have 2 separate domains connecting to the one DHCP server through
> the same VLAN.
>
> Each Domain has its own DNS server, How can I tell the DHCP Server to
> hand out DNS Address to domain A and another to Domain B? as each
> domain has its own DNS server.
>
> At the moment all its doing its handing out the 2 domains with the
> same DNS, IP etc defined in the scope.
>
> Is there any way of telling the DHCP server that if a client comes
> from domain A hand out this DNS addresses and if coming from Domain B
> give it this DNS addresses?
>
> cheers
>
> barry
>
>
 
Back
Top