While reading threads on the list I'm cc'ing this message to, I thought of a similar attack to smurf, that could be a problem based on SMURF attacks. ICMP isn't the only services that can be potentialy exploited via his bug, UDP could be a huge player too. For example those of you familiar with SMB might be able to deduce what I am getting at. Just a little test I did today. dialin:> nmblookup -B broadcast.mydomain.com \* <hidden to protect the innocent> Well then I went to my packet loging facilities. Since the class c that I send the broadcast was primarily windows machines I got approximately 200 replys to this one udp packet. It seems to me that this could be allmost as big of a player as smurf if executed tactfuly. Some common UDP services can be fooled into sending back many more packets than you send in, especialy on windows machines. I sent this to this list in hopes it would be dealt with before widespread exploit of it could take place. Gus Huber <gus@pbx.org>