Contact from (what used to be) CAIS (AS 3491).

Could someone from whoever owns CAIS Internet (AS3491) please contact me offlist? One of your customers has a machine that is making a lame attempt at a DDOS attack. Although ineffectual, it is causing a slight uptick in bandwidth usage and we need to get this stopped before I take it to your upstream. Thanks John P. American Webmasters, Inc.