> From: "Hallam-Baker, Phillip" <pbaker@verisign.com> > Perhaps you could define the term subnet? "IP subnet", or "subnet" in the more general networking (outside-the-IP-community - the null set these days, I know) sense? For the first, originally, back in the days of class A/B/C "network numbers", it was a chunk of address space smaller than the "network" it was assigned from; it was used to provide addresses for a particular physical network. Now that we have CIDR, it seems to basically just means a chunk of address space assigned to a particular hardware network (the second meaning of "subnet"). For the second, it meant a particular physical network, i.e. the collection of end-stations which could send packets directly to each other without going through a router. This was before bridges, hubs, etc. Goodness knows what it means now! I'd suggest "multicast broadcast domain" as a good modern functional definition. Noel