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BenchMark_CompFlag for United States of America

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SBS 2008 initial setup with Exchange 2007

I am currently attempting (for the first time) to setup and configure Windows SBS 2008 with
 Exchange 2007 and it seems I am running into a bunch of issues right off the bat I was hoping
you folks could help me with.  

Firstly this is being installed into an existing network with a SonicWall router installed as
the DHCP server.  I am using the Microsoft press book as at least a basic guide to getting this

My first questions is about the DHCP.  According to the manual and books I need to disable
my router DHCP and enable it on SBS 2008 in order to properly enable exchange and it full scope.
I was curious if this is needed as the Sonicwall handles this rather well at the moment and
I woul dlike to avoid restructuring the network if possible.

Another question I have comes down to DNS and my domain name.  I already own a domain and
website which I host at GoDaddy.  SBS seems to want to host its own domain so that services
such as Outlook anywhere and RWW properly function.  Can I use the domain I already have or
will I need to get another one to properly allow the name to resolve to my server when out of the
office?  Can I utilize the .local domain that is already there?

I know these are basic questions but there is much debate in the office as to which direction
we need to take.

Thank you for any help you can provide or direction you can point me.
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Rob Williams
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To add; If you are unfamiliar with SBS the following links may be quite helpful to you:

Introducing the Connect to the Internet Wizard (CTIW)

Introducing the Internet Address Management Wizard:

Small Business Server 2008 - Build Document
(step by step procedures, tweaks, and tips)
DO WHAT IT SAYS - while you can have DHCP on a router its more often than not problematic, it is essential for exaple that DHCP clients are given the SBS server as their one and ONLY DNS server by DHCP - most routers will default to gibe themselves as the DNS server and this will cause untold issues on your domain. SBS DHCP also contains many additional options not present in a router and of course you can manage SBS DHCP from the SBS server and have full control.
And to reiterate what KCTS is saying.  If the router in question does assign DNS, if it does not assign itself, it assigns the external DNS servers as the local primary and secondary DNS servers.  DNS is central to the proper operation of any domain, but more so with a SBS domain (since SBS includes so many Microsoft Products wrapped in one).

As for having to restructure the environment.  The most you should have to do is reboot the clients after you setup DHCP on the server and disable DHCP on the router.  Most likely, you will even use the same IP scheme as most routers use and most installations of SBS are already bound to the internal network by way of the CEICW.

Believe me, its not half as painful as it seems.

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Yep... Use DHCP on the SBS server and use the Wizards as much as possible, they are magical.

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Thanks everyone for all your input.  I will run all this by the boss and let him know that it seems the best solution is to move forward using SBS as the DHCP server.  This has been a headache long coming :)