Autoconfig & dead horses

Albert Manfredi <manfredi@engr05.comsys.rockwell.com> Fri, 10 May 1996 15:33 UTC

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Date: Fri, 10 May 1996 10:37:00 -0700
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From: Albert Manfredi <manfredi@engr05.comsys.rockwell.com>
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Subject: Autoconfig & dead horses
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mohta@necom830.hpcl.titech.ac.jp wrote:

[ ... ]

> If you think OSI hierarchy is perfectly good, use it with native
> ATM. Rest of us who use IP will flatten unnecessarily hierarchies.

I think I agree _completely_ with the words Masataka speaks, but not with
the intended negative tone.

Fundamentally, I find this discussion about wasting the SEL byte for IPv6
to be baffling. I know this makes Grenville impatient.

We have 16 bytes of IPv6 address and 20 bytes of ATM NSAPA. Both are
global addresses. Therefore, right up front, we know that there are not
just 256 wasted associations if we don't make use of SEL, but rather
4 billion wasted associations no matter what we do.

The question then is which bytes do we prefer to set aside when mapping
IPv6 to NSAPA?

Hell, we're wasting 253 AFI values too. Why don't we define a fourth AFI
value to denote "IPv6 address," and simply incorporate IP routing within
ATM switches?? (Yes, cool off Grenville, there are small problems with
multicast and the like. Sheesh.)

Bert
manfredi@engr05.comsys.rockwell.com