Heya everyone, we have been getting reports lately about unsecured UDP chargen servers in our network being abused for reflection attacks with spoofed sources http://en.wikipedia.org/wiki/Character_Generator_Protocol | In the UDP implementation of the protocol, the server sends a UDP | datagram containing a random number (between 0 and 512) of characters | every time it receives a datagram from the connecting host. Any data | received by the server is discarded. We are seeing up to 1500 bytes of response though. This seems to be something new. There aren't a lot of systems in our network responding to chargen, but those that do have a 15x amplification factor and generate more traffic than we have seen with abused open resolvers. Anyone else seeing that? Anyone who can think of a legitimate use of chargen/udp these days? Fortunately I can't, so we're going to drop 19/udp at the border within the next hours. Regards, Bernhard