Is there a program which users can run on an end-site workstation which would test whether they are being some link which is doing BCP38, or some related type of source-address ingress filtering? I'm hoping for something that could be downloaded by users and run, and try to forge a few packets to somewhere useful, which could be logged somehow in conjunction with some unforged packets containing a traceroute, so we could build up a database of leaky networks. On a related topic, while I know GRC Research's Steve Gibson is a bit of a polarizing personality, he does have a fairly sizable consumer audience, and might be a great distribution venue for such a thing. Or, perhaps, is there someone on here from Ookla? Patrick? Could Akamai be persuaded to take an interest in this as a research project? Cheers, -- jra -- Jay R. Ashworth Baylink jra@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII St Petersburg FL USA #natog +1 727 647 1274