Small Business Server - adding a seperate domain to the same LAN?

Five_Star · 5 Mar 2010 at 11:37

Hi,

We have downsized the company in recent months and have sub let some of our office space. A second company is moving in and are bringing their own server and are going to run it over the same cabling as our machines use.

What problems can anyone foresee us having if they run their domain controller (Server 2008 R2) on our LAN using the same address space. Our Domain is controlled from a single box running Small Business Server 2008.

Example of the setup:
SBSDomain1 - 172.16.3.1 -> 125
NewDoamin2 - 172.16.3.150 -> 200

Will this work?

Also we are going to share our internet connection with them, I assume its as simple as telling their machines that the gateway is on 172.16.3.254?

Five_Star · 5 Mar 2010 at 12:33

atomiser said:
do you have a half decent switch that supports vlans?

No we only have a basic 24 port unmanged one, I can ask but I suspect that this new company will have a switch they are using now that we could keep them on.

I guess using the separate switch would not allow the second company to share our internet connection?

What exactly is it about this setup that is going to cause problems? I suspect our MD has promised these new guys use of the internet already and he is bound to ask why even though I'm a programmer not a LAN manager.

I mean if we try it will it break horribly right away or will we get little niggles appearing later on?

Five_Star · 5 Mar 2010 at 13:21

Sorry I really am terrible about explaining our setup here, we don't use SBS 2008 in the usual way we really use it as a glorified Server 2008 box with Exchange installed.

The Firewall is a Cisco 5505 ASA, this manages the DHCP setup with the servers IP hard coded.
SBS does nothing more than manage users, groups, exchange, shares and DNS.

The real question is then will SBS 2008 complain or fall over if we add an new domain controller for a totally new domain to the same network, I was under the assumption that SBS didn't play nice with other domains on its same network or am I wrong here (because I hope I am)

Five_Star · 8 Mar 2010 at 08:23

Just an update on this, thanks to oddjob62 for the confirmation that it wouldn't fall down. Got the new company server powered up and setup the conditional forwarder and it seems to be working fine for now.

Other interesting news is that the new company is the brothers of our MD so I guess its going to have to be cool on the LAN sharing side of things. I've already been told to give them access to the printers etc so I guess we're now a company with a new company inside us.

If I ever get time to finish my programming work I'll suggest the vlan idea to the higher ups. Thanks for the support.