I would like to amplify Howard's comments below and doubly stress two words in his one line explanation, namely "controlled" and "violation".
In terms of **Internet Gateways** (read routers) this is an acceptable practice for what the RFC describes in its title, "Using 31-Bit Prefixes on IPv4 Point-to-Point Links". In my humble opinion, that is the **ONLY** place where this should be used. A case in point is this: 3.1. "Requirements for Internet Hosts -- Communication Layers" [RFC1122] Section 3.2.1.3 (e) is replaced with: (e) { , , -1 } Directed broadcast to the specified subnet. It MUST NOT be used as a source address, except when the originator is one of the endpoints of a point-to-point link with a 31-bit mask. Anybody want to take any bets as to how well that will work on your standard Winthing? I already tried it, and it is very unhappy (to put it mildly). This goes back to a previous post and a previous discussion we had about IP subnet zero and the subtle differences spelled out on RFC 1122 and RFC 1812. I submit then, as I do now, that RFC 1122 does still remain in force and describe the intended behavior of Internet hosts (non- Gateways/routers). Personally, I would not have recommended the change listed in the paragraph above, since it clearly has very little relevance (how many Internet hosts sit on a local area network with a point to point connection?) If what I said was not clear enough, heed these words - test this out wherever you think you may want to implement it, and make sure it works for everything you need to do. I can't wait to shed the legacy baggage of IPv4. v/r, Paul Werner > >I read the RFC, so I guess it can be used. My bad. > > > >AM I correct in saying that one interface will be assigned the all zero > >subnet as it's IP and the other will be assigned the broadcast IP > address > >for that subnet? > > > >Steve > > > Yes. It's a controlled violation of that addressing rule. ________________________________________________ Get your own "800" number Voicemail, fax, email, and a lot more http://www.ureach.com/reg/tag Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=27878&t=27802 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]