----- Original Message -----
From: "Fred Baker" <fred(_at_)cisco(_dot_)com>
To: "Jason Gao" <jag(_at_)kinet(_dot_)com(_dot_)cn>
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
All 8-bits of the TOS field are available for routing. There are no ECN bits.
Look in the code.
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
where TOS=0*x or *0x, but those are easy to note and handle as the transition
2002:[IPv4]:000X:03DB:...IPv8 is closer than you think...