Two domains, two dhcp servers (help with subnet)

15 pts.
Tags:
DHCP
DHCP commands
Microsoft Windows Server 2003
Subnet mask
Subnets
Windows Server 2003 Domain
Hi all, I am having some trouble and I can't get forward... I have two different domains running, both are in the same network. (Scenario is that DC1 is the primary domain of an existing company and DC2 is a new domain for a new company) The DC1 of Domain1 has the ip 10.128.101.3 and the DC2 of Domain2 has the ip 10.128.102.3 Right now both have the subnet 255.0.0.0 Everything is working fine and I they are able to communicate (DNS) also working. What I need is to have two DHCP servers. One on DC1 and one on DC2. DC1 DHCP is giving IPs for company one's clients - 10.128.101.20-10.128.101.150 DC2 should have two scopes - the first is for 10.128.101.150-254 and should be considered as a backup if DC1 is gone. The second scope on DC2 should give ip's to the clients of domain two - 10.128.102.20-10.128.102.254 DHCP won't let me set the two scopes on DC2 as the same subnet - 255.0.0.0 and I don't see any possibility to do what I want without routing. So I need to know what subnet to set and how can I configure WIN SRV 2003 as a router on one of the systems so that they will be able to communicate. I hope you understand me... Thanks for the help.

Software/Hardware used:
Windows Server 2003

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Simple problem there my friend – both domains are currently on the same subnet (Network Range). The 255.0.0.0 (/8) you mentioned can be “subnetted” to smaller chunks that will solve the issue you’re having.

From what you’ve posted, a good option is to change your subnet mask to a /24 (255.255.255.0):

Domain 1 = 10.128.101.x 255.255.255.0
Domain 2 = 10.129.102.x 255.255.255.0

Then all you will need is to ensure that you have IP routing set up (if you want the two subnets to be able to communicate with each other.) I know Windows server can be configured to do some simple routing within itself – Good “how-to” from Microsoft.com

Discuss This Question: 3  Replies

 
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  • Encrypt1
    Thank you! Exactly what I did and it seems to be working now.
    15 pointsBadges:
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  • Sixball
    Thanks for the Feed-back! :)
    8,705 pointsBadges:
    report
  • Genderhayes
    DHCP works on broadcast traffic; you should only really use multiple DHCP
    servers on the same subnet with a supernet  and the 80/ 20 split require all scopes defined, but the opposite scopes must be disabled.
    7,770 pointsBadges:
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