Date: Sun, 5 May 1996 01:56:28 -0500 From: Jim Fleming <JimFleming@unety.net> To: "'Darren Reed'" <avalon@coombs.anu.edu.au>, Jim Fleming <JimFleming@unety.net> Cc: "FreeBSD-hackers@freebsd.org" <FreeBSD-hackers@freebsd.org> Subject: RE: IPv8 Tutorial #1: Minimal IPv8 hack Message-ID: <01BB3A26.1428B140@webster.unety.net>
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On Sunday, May 05, 1996 11:42 AM, Darren Reed[SMTP:avalon@coombs.anu.edu.au] wrote: @ In some mail from Jim Fleming, sie said: @ > @ > @ > There are macros to test the version and options bits... @ > @ > @ > @ > You have to use "&" and not "==" to make sure you @ > @ > are testing just one bit at a time. Only the high bit @ > @ > of the IPv4 version field (ip->ip_v) is used for version. @ > @ @ > @ But 4 = 0100, 6 = 0110, 8 = 1000, etc. @ > @ > Yes...and you will note that 4 and 6 both have the high @ > bit as 0. IPv8 takes that bit, sets it to 1 and then "borrows" @ > the other bits. A more accurate description would be... @ > @ > "@ But 4 = 0100, 6 = 0110, 8 = 1XXX, etc." @ @ So you want to reserve half of the IP version numbers for your own protocol ? That is one way to describe it...just as IANA reserves huge blocks of IP addresses and forces ISPs to beg for addresses from a tiny portion of the address space...Oh that's right the router tables are filling up... so let's slow start all of the ISPs and fragment the IPv4 address space and make the situation so bad that everyone is encouraged to seek IP addresses from "upstream providers"...and the big get bigger and most people beg for resources that are "reserved" for selected people... Another way to look at this is to describe the usage of the following IP version numbers.... 0 - ??? 1 - ??? 2 - ??? 3 - ??? 4 - Used by most systems 5 - ??? 6 - Proposed for IPv6 7 - ??? Are the other version numbers "wasted"... is there such a thing as ecology in the Internet... does only the IANA get to waste/reserve Internet resources...??? <snip> -- Jim Fleming UNETY Systems, Inc. Naperville, IL e-mail: JimFleming@unety.net
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