On Tue, 13 Dec 2011 14:09:19 +0000 Martin Gregorie wrote:
> At the risk of exposing my ignorance, I had a thought. > > Since the entire 127/8 is reserved for loopback, nothing in the > 127.0.0/24 block should be used as addresses. So, what is preventing > RBLs and RWLs from using the third octet as a status indicator? It > seems to me that the 4th octet can be used as at present as a query > response which would by convention be a valid response if the 3rd > octet is zero. OTOH if the 3rd octet was non-zero, this would > indicate that the response is invalid, so this could provide an > unambiguous way for the various RBLs and WLs to tell individual users > to go away if they exceeded use limits, had an expired subscription, > etc. In DNSWL the 3rd octet contains a code for the type of business. They could define an invalid code in the last octet if they wanted to, but presumably they want people to notice if they are over quota.
