>> It looks like the sites John talked to are multihomed, NOT doing >> routing at their edge (??), and yet wanting to filter? I don't think > >that's not clear, from john's description at least. I can ask (the meeting's not over yet) but I gather that these are multihomed customers who don't do BGP. The ISP knows what ranges it's routing to the customer, but it doesn't know what ranges are routed to the same customer by someone else. R's, John