BTW - do we want to mention "root" as the system administration of a specific host to report things like "your multicast implementation is broken and spewing ICMP packets" or other "fix that beast" messages.

I don't think it's a good idea to mention "root". I've seen far too many cases of email to root being read very seldom, or not at all. Steinar Haug, Nethelp consulting, sthaug@nethelp.no