I am setting up a replacement forest/domain for one of my sites with approx 130 users. I want to setup the new forest/domain and get everything setup correctly, while our 130 users are still connecting to the old forest/domain. Can I do this while they are still using the existing IP Subnets? e.g. 192.168.50.0 for both the old forest and the new forest? I won't be setting up DHCP until the weekend that I am migrating all the users, so this won't be a problem.
Is there anything else that may cause problems or am I ok to proceed?