If there is a way to achieve the same goal without having impact on the live network at this stage, why do that way? Eric-jan's approach accomplishes that. By the way, Peter has a nice summary of the approach. A live network is something which is very hard to simulate, as anyone who has worked on new software or procedures for an operational network will probably tell you. I don't understand your objection - we have people who are willing, able, and ready to cut some of their operational traffic over to using CIDR addressing. This is with the full knowledge that there might be problems. Why not let them do it? We will, of course, keep configurations in place to allow them and us to back- out dependancies on CIDR on a moment's notice, in case things don't work and we can't fix the CIDR infrastructure in a timely manner. Like the commercial says: "Just Do It". --Vince