Robert ELz made most of the points I'd want to make, but for:
Vernon Schryver wrote:
...
> - claim much better QoS mechanisms
IPv6 doesn't. IPv6 offers *exactly* the same QOS mechanisms as IPv4,
namely IP Integrated Services and IP Differentiated Services. (There
is also the flow label field in IPv6, but there are as yet no detailed
specs of how it will be used and no false claims either).
...
> - suffer standards committee bloat and silliness, such as the typical
> standards committee doubling of the IPv6 address from 64 to
> 128 bits,
This was very specifically to enable an adequate (64 bit) locator
component and an adequate (64 bit) identifier component in the address.
And this was based on experience with several datagram network architectures
of the past. The only realistic alternative was variable length addresses.
But since we settled this in 1994, it seems somewhat beside the point.
Brian
the lunacy of 48 byte cells and the 54 flavors of AAL.
> - no one yet understands how to really make IPv6 or AAL work or even
> play nice with IPv4 during a transition. (The big unknowns I see
> with both are in application code. I have some application code
> that is supposed to do both IPv4 and IPv6, but ....)
>
> The differences are
> - IPv6 is tolerates applications that want datagram-like service
> - some relatively minor technical details such as cell overhead
> and stupid ATM switches that didn't drop entire upper layer
> packets when one cell is lost.
> - ATM switches were supposed to be unlike IPv4 routers, or infinitely
> fast and too cheap need purchase orders because the telcos would
> be buying so many of them, but turned out more like telco CO's.
> IPv6 routers are supposed to be just like IPv4 routers.
> - non-technical forces that might actually cause IPv6 to replace IPv4.
> They can be summarized as IPv6 came from the IETF while ATM was
> from the other guys
>
> Vernon Schryver [EMAIL PROTECTED]
--
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Brian E Carpenter
Program Director, Internet Standards & Technology, IBM
On assignment for IBM at http://www.iCAIR.org
Board Chairman, Internet Society http://www.isoc.org
Non-IBM email: [EMAIL PROTECTED]
