----- Original Message ----- From: "Fred Baker" <fred@cisco.com> To: "Jason Gao" <jag@kinet.com.cn> Cc: <ietf@ietf.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 http://www.ntia.doc.gov/ntiahome/domainname/130dftmail/unir.txt