Help with IP addresses for server set up


We currently have an SBS 2003 server as our PDC.  The IP range is - and the subnet is  Our router/gateway is currently

I am in the process of configuring a new server and am setting it up as a new domain.  From what I have read our current IP range is a public rather than a private IP range and we would be better using somthing like - with subnet

I would like to set the new server up initially with an IP address within the new range (which wont be in effect until the new server is up and running and I transfer all my users over etc).  My problem is; how do I give my new server a new IP address/subnet mask but still configure it to access the internet to enable me to add all the updates, download some software etc.

Or, can I give it an IP address that works on our current network, configure everything and then just change it later? If I set everything up with a 192.1.1.x address, subnet will this cause issues with my RWW, DCHP etc later?

Or, is there not really a major problem in staying on the 192.1.1.x range?

As you may be able to tell; I know next to nothing about this so any advice would be greatly received.  Thanks....
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It is definitely a better idea to use a private ip range for your internal network.  It's a really bad idea to keep using 192.1.1.x range.

To set this up you need to change the ip range of the router.  The computers on your network will only recognize other computers within the same subnet.  Change the ip of the router to something like (it doesn't matter what ip).  This will become your 'Gateway'.  The 'outside' ethernet connection on the router will have the internet facing ip address that your Internet Service Provider has assigned to you...don't worry about this.   You will need to change the ip of all your computers in the network into that range too.  If you're using dhcp then simply type 'ipconfig /renew' at a command prompt.
Dave MessmanIT ConsultantCommented:
Theoretically, you can stay in the range as long as you never interact with that set of IP addresses on the internet.  However, best practice is to use one of the standard private address bases like, or  SBS 2008 is supposed to force you to use one of the standard private address bases - so there's one practical reason to use one of those.

You can set your new server up with 192.168.1.XX and then change it later - or you could use a router to server as a sort of bridge.

Set up your server as  Put a Linksys or Netgear or whatever router you want on the LAN and give it an address of 192.168.1.XX on the WAN side and on the LAN side.  Then your new box will have internet access without needing to be on the address base.

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SarahWHAuthor Commented:
That's what I thought and that is what I will do when my new server goes live.  However currently I am in the process of setting up and configuring it and need to be able to access the internet through my router which is currently  

Can I give my new server a 192.1.1.x IP address and then change it to 192.168.1.x when I want to go "live"? Will changing its IP address and subnet cause any difficulties with the RWW etc that will already have been configured or will it be ok as long as I use the correct wizard to make the changes?
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Dave MessmanIT ConsultantCommented:
>> Or, can I give it an IP address that works on our current network, configure everything and then just change it later? If I set everything up with a 192.1.1.x address, subnet will this cause issues with my RWW, DCHP etc later?

yes, can do that.  If this is an SBS 2003 or SBS 2008 box, there are wizards that make all those changes for you when you change the server's IP address.
SarahWHAuthor Commented:
I like your idea of using a router on the Lan - so I would set the router up with a lan address of and have its Wan address as 192.1.1.x which will work on my existing network.  That way I can configure the server with its final IP address, subnet etc.

Then, when I am ready to go live I simply remove that router, adjust the settings in my primary router (currently and fingers crossed all will be well!

Have I got the right idea?
Dave MessmanIT ConsultantCommented:
That's the right idea - and that will work fine.
SarahWHAuthor Commented:
Fantastic and speedy help; many thanks :)
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