Two Domains on Same Network--best practices

Posted on 2007-10-18
Last Modified: 2012-08-14
i have a client with two servers (SBS2003 SP2) and domains on the same network/subnet (on the same floor of a building). currently a cisco 2800 series router is the gateway, dns and dhcp host. this kind of works, but has been causing some issues i believe with Active Directory, etc. i'm used to having the domain controller use DHCP and DNS.

my question is, with this situation--2 servers/domains and a cisco 2800 gateway--what is the best way to set this up? i'm sure there's different solutions so i'm interested in your opinion. an example of an issue i have is that sometimes group policy is only partially applied when logging in, and when trying to add a new system to the domain via the web console (used with SBS2003) it says that it can't find the list of computers and to make sure that the gateway router uses the domain server as the main DNS...but i have two domain servers :-)

any advice appreciated.
Question by:goldylamont
    LVL 95

    Accepted Solution

    I would suggest splitting them into two subnets - one SBS on, for example, and the other on  This way, each has it's own logical network space, can handle DHCP and DNS, and should otherwise work fine.

    HOWEVER, if that's not possible, my next best solution would be to setup ONE network with STATIC addresses and the other with Dynamic or Static.  You really can't have BOTH be dynamic because of the possibility of overlapping DHCP address pools and, even if you guard against that, you have the possibility that a client gets an address and thus wrong DNS information from the wrong server.  

    Author Closing Comment


    Featured Post

    Looking for New Ways to Advertise?

    Engage with tech pros in our community with native advertising, as a Vendor Expert, and more.

    Join & Write a Comment

    Suggested Solutions

    Tired of waiting for your show or movie to load?  Are buffering issues a constant problem with your internet connection?  Check this article out to see if these simple adjustments are the solution for you.
    Creating an OSPF network that automatically (dynamically) reroutes network traffic over other connections to prevent network downtime.
    This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles to another domain controller. Log onto the new domain controller with a user account t…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

    746 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    18 Experts available now in Live!

    Get 1:1 Help Now