Has anyone done a (statistical) corelation and regression exercise between number of announced prefixes from peers, and traffic sent to them, and if so would they be prepared to publish the consolidated data (if not the anonymized data set)? Equally is there a corellation between advertised address space and traffic sent? Yes, there is an operational reason for this question. Essentially I'd like to know (a) whether advertized prefixes have a definable average "value" as well as "cost" (cost in terms of router resources), and (b) to what extent total prefixes is in practice a good measure of network size for peering decisions, or whether one really needs go do the Netflow. For instance on (a) I have noticed one inverse corelation - networks which are poor at CIDR tend to cause more aggro and give less value than the equivalent total address space. I am interested more in statistical data than opinion, the former of which I have have a lack of, the latter a surfeit. I will anonymize and summarize useful private replies to this list unless a preference otherwise is indicated. -- Alex Bligh GX Networks (formerly Xara Networks)