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ECN....Re: Fuzzy-layering and its suggestion

2002-09-05 23:02:55
----- Original Message ----- 
From: "Fred Baker" <fred(_at_)cisco(_dot_)com>
To: "Jason Gao" <jag(_at_)kinet(_dot_)com(_dot_)cn>
Cc: <ietf(_at_)ietf(_dot_)org>
Sent: Thursday, September 05, 2002 3:58 PM
Subject: Re: Fuzzy-layering and its suggestion


At 09:11 PM 9/5/2002 +0800, Jason Gao wrote:
--- TCP with ECN extension

has already been a practice of fuzzy-layering.

TCP in the end system and IP in the intermediate systems share the two ECN 
bits in the IP header.

that is incorrect. First off, IP also is found in the end system, and uses 
the ECN bits.


Attempts to redefine the IPv4 Header to block clear paths to using all 160 bits 
in the IPv4 Header
for extended addressing and routing have been political in nature, not 
technical.

All 8-bits of the TOS field are available for routing. There are no ECN bits. 
Look in the code.
http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=tos+routing

The 8-bit TOS field can be split into two 4-bit fields to add 4 extended 
addressing bits to
the 32-bit addressing. You might view this as saying all one-story buildings 
now have 15
more floors above them for expansion. Yes, there are special attributes about 
the cases
where TOS=0*x or *0x, but those are easy to note and handle as the transition 
is made.


Jim Fleming
2002:[IPv4]:000X:03DB:...IPv8 is closer than you think...
http://ipv8.dyndns.tv
http://ipv8.yi.org
http://ipv8.dyns.cx
http://ipv8.no-ip.com
http://ipv8.no-ip.org
http://ipv8.no-ip.biz
http://ipv8.no-ip.info
http://www.iana.org/assignments/ipv4-address-space
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