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.
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