If I receive some traffic at an IXpeering router interface, I might want to know how I got it. If it is a stream of bad traffic I might want to ask my upstream peer to help turn it off. How do I find out who did send it to me? If I capture a sample packet I could see the source MAC address. Now I have to identify who owns the device with that MAC. Is there any guidance from the IX operators on how to do this? I'm sure phone calls / emails to Ops teams are not cost effective for anyone. A common programmatic method across IXes would suit my use-case admirably. I'd like to hear from anybody who either has a method in an IX, or who would like a method to exist. Regards Steve Steve Nash CEng MIET | Consultant Engineer EMEA Arbor Networks +44 7720 291359 (m) http://www.arbornetworks.com/