I am debating if I should do my ISATAP lab with a Longhorn server as the ISATAP router or use an existing Cisco router to perform this function. I think a lot of folks who are from the server centric camp will run their AD/DNS server as an ISATAP router to make things easy. Problem is it makes doing ISATAP with a 6to4 gateway a little more difficult. I am going to have to play around a bit to see what the optimal configuration is to get that working. Anyone set ISATAP up in both configurations and have an opinion?