From owner-freebsd-hackers Mon Apr 8 19:50:09 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id TAA28765 for hackers-outgoing; Mon, 8 Apr 1996 19:50:09 -0700 (PDT) Received: from whizzo.transsys.com (whizzo.TransSys.COM [144.202.42.10]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id TAA28712 for ; Mon, 8 Apr 1996 19:49:59 -0700 (PDT) Received: from localhost.transsys.com (localhost.transsys.com [127.0.0.1]) by whizzo.transsys.com (8.7.5/8.7.3) with SMTP id WAA06191; Mon, 8 Apr 1996 22:48:06 -0400 (EDT) Message-Id: <199604090248.WAA06191@whizzo.transsys.com> X-Authentication-Warning: whizzo.transsys.com: Host localhost.transsys.com [127.0.0.1] didn't use HELO protocol To: Jim Fleming cc: "'Bill Fenner'" , "terry@lambert.org" , "hackers@freebsd.org" From: "Louis A. Mamakos" Subject: Re: Check IP Version In-reply-to: Your message of "Mon, 08 Apr 1996 18:05:24 CDT." <01BB2575.F67FE9C0@webster.unety.net> Date: Mon, 08 Apr 1996 22:48:06 -0400 Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > Of course in C+@nIP (or IPv8 as some call it)...we only use the single high bit > of the IP version field as a flag. The other three bits of the version field are > borrowed for other purposes along with the Header Length and Checksum fields. > This does not exactly follow the "spec" but it provides us with the flags we > need to grow our way out of the suppsed IP address shortage. So I guess there can't be an IPv9..? Of course the real problem is not a shortage of addresses, it's a surplus of globally visible routes and their associated dyanmic behavior which default-less routers on the Internet have to deal with. There's oodles of space in the class-A space available. What IPv6 does is promote easy renumbering to allow for much higher degrees of route aggregation. louie