This is where I'm confused:
Say you have a home network in a domain environment. And a work network also in a domain environment. Your DHCP scopes are identical (192.168.1.0). (I have this setup but my work DHCP scope is 192.168.0.0 and home is 192.168.1.0, and I VPN back and forth all the time) So I can't test the same scope scenario unless I changed one of the scopes. Anyway if my home IP address is 192.168.1.100 and I VPN into work. RAS is configured to use 192.168.0.30-35 for VPN connections. So the IP address assigned for the connection is different than the home IP address. So even if you have 192.168.1.100 leased on the work network, and your home IP is also 192.168.1.100, when you connect the server will assign the VPN connection an ip that is different then 192.168.1.100.
Does that make sense?