IP Recommendation for Remote Office

Hello.  I am running a Windows environment here and Active Directory is currently a Windows 2003 domain.  

I am setting up a new sales office and am building a domain controller for that location to replicate to the DC's at the corporate headquarters. They will be connected via an Internet Connection and a soft VPN tunnel via the Firewalls (which are the same Firewall).

 I am wondering in terms of IP addressing and DHCP, do I need to define a separate subnet or can I extend my existing IP Infrastructure to accommodate the addresses at the remote office?  Any recommendations?  Thanks.
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TeeshirtConnect With a Mentor Commented:
You can do both. But in what whatever scenario, you should allow the subnet through the tunnel.
jnordengAuthor Commented:
Ok, thanks..  Just wanted to confirm the options.
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