< draft-ietf-ipv6-ipaddressassign-04.txt		draft-ietf-ipv6-ipaddressassign-05.txt >
	Internet M. Blanchet		Internet M. Blanchet
	Internet-Draft Viagenie inc.		Internet-Draft Viagenie inc.
	Expires: January 30, 2003 August 2002		Expires: May 19, 2003 November 18, 2002
	A Flexible Method for Managing the Assignment of Bits of an IPv6		A Flexible Method for Managing the Assignment of Bits of an IPv6
	Address Block		Address Block
	draft-ietf-ipv6-ipaddressassign-04		draft-ietf-ipv6-ipaddressassign-05
	Status of this Memo		Status of this Memo
	This document is an Internet-Draft and is in full conformance with		This document is an Internet-Draft and is in full conformance with
	all provisions of Section 10 of RFC2026.		all provisions of Section 10 of RFC2026.
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF), its areas, and its working groups. Note that		Task Force (IETF), its areas, and its working groups. Note that
	other groups may also distribute working documents as Internet-		other groups may also distribute working documents as Internet-
	Drafts.		Drafts.
	skipping to change at page 1, line 32 ¶		skipping to change at page 1, line 32 ¶
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	The list of current Internet-Drafts can be accessed at http://		The list of current Internet-Drafts can be accessed at http://
	www.ietf.org/ietf/1id-abstracts.txt.		www.ietf.org/ietf/1id-abstracts.txt.
	The list of Internet-Draft Shadow Directories can be accessed at		The list of Internet-Draft Shadow Directories can be accessed at
	http://www.ietf.org/shadow.html.		http://www.ietf.org/shadow.html.
	This Internet-Draft will expire on January 30, 2003.		This Internet-Draft will expire on May 19, 2003.
	Copyright Notice		Copyright Notice
	Copyright (C) The Internet Society (2002). All Rights Reserved.		Copyright (C) The Internet Society (2002). All Rights Reserved.
	Abstract		Abstract
	This document proposes a method to manage the assignment of bits of		This document proposes a method to manage the assignment of bits of
	an IPv6 address block or range. When an organisation needs to make		an IPv6 address block or range. When an organisation needs to make
	an address plan for its subnets or when an ISP needs to make an		an address plan for its subnets or when an ISP needs to make an
	address plan for its customers, this method enables the organisation		address plan for its customers, this method enables the organisation
	to postpone the final decision on the number of bits to partition in		to postpone the final decision on the number of bits to partition in
	the address space they have. It does it by keeping the bits around		the address space they have. It does it by keeping the bits around
	the borders of the partition to be free as long as possible. This		the borders of the partition to be free as long as possible. This
	scheme is applicable to any bits addressing scheme using bits with		scheme is applicable to any bits addressing scheme using bits with
	partitions in the space, but its first intended use is for IPv6. It		partitions in the space, but its first intended use is for IPv6. It
	is a generalization of RFC1219 and can be used for IPv6 assignments.		is a generalization of RFC1219 [1] and can be used for IPv6
			assignments.
	Table of Contents		Table of Contents
	1. Rationale . . . . . . . . . . . . . . . . . . . . . . . . . . 3		1. Rationale . . . . . . . . . . . . . . . . . . . . . . . . . . 3
	2. Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3		2. Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
	3. Description of the Algorithm . . . . . . . . . . . . . . . . . 4		3. Description of the Algorithm . . . . . . . . . . . . . . . . . 4
	3.1 Leftmost . . . . . . . . . . . . . . . . . . . . . . . . . . . 4		3.1 Leftmost . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
	3.2 Rightmost . . . . . . . . . . . . . . . . . . . . . . . . . . 4		3.2 Rightmost . . . . . . . . . . . . . . . . . . . . . . . . . . 4
	3.3 Centermost . . . . . . . . . . . . . . . . . . . . . . . . . . 5		3.3 Centermost . . . . . . . . . . . . . . . . . . . . . . . . . . 5
	4. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 5		4. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
	skipping to change at page 7, line 48 ¶		skipping to change at page 7, line 48 ¶
	last;		last;
	}		}
	else {		else {
	return 0 if ($i == $nbits-1);		return 0 if ($i == $nbits-1);
	$Abits[$w] = 0;		$Abits[$w] = 0;
	}		}
	}		}
	$abits = join("",@Abits);		$abits = join("",@Abits);
	$ip = "";		$ip = "";
	for($i=0;$i<8;$i++) {		for($i=0;$i<8;$i++) {
	$ip .= sprintf("%lx", unpack("n", pack("B16", substr($abits, $i * 16,16)))) . ":";		$ip .= sprintf("%lx",
			unpack("n", pack("B16", substr($abits, $i * 16,16)))) . ":";
	}		}
	chop $ip;		chop $ip;
	$ip =~ s/(:0){2,}$/::/;		$ip =~ s/(:0){2,}$/::/;
	return($ip . "/$pl");		return($ip . "/$pl");
	}		}
	#===============================================================		#===============================================================
	#		#
	#Usage example: allocation of 100 /48 using "centermost" method		#Usage example: allocation of 100 /48 using "centermost" method
	#		#
	my $Prefix = '3ffe:b00::/48';		my $Prefix = '3ffe:b00::/48';
	skipping to change at page 8, line 31 ¶		skipping to change at page 8, line 32 ¶
	Thanks to Steve Deering, Bob Hinden, Thomas Narten, Erik Nordmark,		Thanks to Steve Deering, Bob Hinden, Thomas Narten, Erik Nordmark,
	Florent Parent and Jocelyn Picard for their very useful comments on		Florent Parent and Jocelyn Picard for their very useful comments on
	this work.		this work.
	References		References
	[1] Tsuchiya, P., "On the assignment of subnet numbers", RFC 1219,		[1] Tsuchiya, P., "On the assignment of subnet numbers", RFC 1219,
	April 1991.		April 1991.
			[2] Bradner, S., "The Internet Standards Process -- Revision 3", BCP
			9, RFC 2026, October 1996.
	Author's Address		Author's Address
	Marc Blanchet		Marc Blanchet
	Viagenie inc.		Viagenie inc.
	2875 boul. Laurier, bureau 300		2875 boul. Laurier, bureau 300
	Sainte-Foy, QC G1V 2M2		Sainte-Foy, QC G1V 2M2
	Canada		Canada
	Phone: +1 418 656 9254		Phone: +1 418 656 9254
	EMail: Marc.Blanchet@viagenie.qc.ca		EMail: Marc.Blanchet@viagenie.qc.ca
End of changes. 6 change blocks.
	5 lines changed or deleted		10 lines changed or added
This html diff was produced by rfcdiff 1.48. The latest version is available from http://tools.ietf.org/tools/rfcdiff/