10_IPv6_spring10

10_IPv6_spring10 - TCP/IP Essentials EL5373 Supplement...

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Unformatted text preview: TCP/IP Essentials EL5373 Supplement Topic EL5373 Supplement Topic Internet Protocol Internet Protocol version 6 version 6 Spring 2009 Polytechnic Institute of NYU Slide 2 zjzhao IP V6 Background In the early 1990s, the IETF realized that IPV4 address space was near exhaustion H ratio analysis for address assignment efficiency: RFC1715 Began work on the next generation of IP: IPv6 Incorporated many of the experiences learned from IPv4 Went through a number of iterations In addition to larger address space (16 octets instead of 4 octets), IP V6 provides many enhanced intrinsic capabilities Better structured address space Better multicast support Better mobile support Neighbor discovery Support for authentication & payload encryption QoS support, etc. Internet operators approach Assign private V4 address to growing IP endpoints with deployment of SP-NAT Use public addresses migrate to V6 or stay with V4 if enough address space Polytechnic Institute of NYU Slide 3 zjzhao IP V4 Address Preservation When IP V6 was being developed, there was an on-going effort to preserve IP V4 address CIDR (Classless Inter-domain Routing) DHCP (Dynamic Host Configuration Protocol) Allocation for private address (RFC 1918) NAT (Network Address Translation) Various tunneling technologies (MPLS, GFE) Very Successful in prolonging the life span of IP V4; however These interim techniques all have some drawbacks Many experts feel that V6 deployment will reach the critical mass soon Polytechnic Institute of NYU Slide 4 zjzhao V4 Address Exhaustion A Closer Look Time T K V4 Address Exhaustion Window IANA RIR SP SP T I : IANA V4 address pool exhausted T R : RIR V4 address pool exhausted T S : SP address pool exhausted/constrained T K : operators kicks off V6 migration T S may be earlier or later than T I /T R , depending on operators possession of V4 addresses T K may be earlier or later than T S Earlier operator starts migrating to V6 before V4 address exhaustion occurs Later operator starts with V4 private address first, then migrates to V6 T R T I T S Exhaustion Date Currently projected in Sept. 2011 (IANA) and June 2012 (RIR) (http://www.potaroo.net/tools/ipv4/index.html) Polytechnic Institute of NYU Slide 5 zjzhao Some IPv6 Terminology an IPv6-layer identifier for an interface or a set of interfaces Address a nodes attachment to a link Interface nodes attached to the same link Neighbors a communication facility or medium over which nodes can communicate at the link layer, i.e., the layer immediately below IPv6 Link any node that is not a router Host a node that forwards IPv6 packets not explicitly addressed to itself Router a protocol module that implements IPv6 Node Polytechnic Institute of NYU Slide 6 zjzhao IPv6 Address Uses 128 bits to support at least one billion networks colon hexadecimal notation with a colon to separate every 16 bits...
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This note was uploaded on 11/02/2010 for the course EL 537 taught by Professor Zhaozhengxue during the Spring '10 term at NYU Poly.

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10_IPv6_spring10 - TCP/IP Essentials EL5373 Supplement...

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