HP-UX IPv6 Transition Mechanisms White Paper

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HP-UX IPv6 Transition Mechanisms

White Paper

Table of Contents

Table of Contents................................................................................................................... 1

1. Executive Summary............................................................................................................................... 2

2. Overview .............................................................................................................................................. 3

3. Terminology.......................................................................................................................................... 3

4. Dual Stack ............................................................................................................................................ 3

5. Tunneling .............................................................................................................................................. 4

5.1 Host-to-Host..................................................................................................................... 4

5.2 Router-to-Router................................................................................................................ 5

5.3 Host-to-Router and Router-to-Host........................................................................................ 5

6. 6to4 ...................................................................................................................................................... 6

7. Transition from IPv4 to IPv6 .................................................................................................................. 7

8. Deployment Scenario ........................................................................................................................... 8

8.1 Access to Payroll Application in the Main Office ................................................................. 9

8.2 Access to Accounting Application in Branch Office A .......................................................... 9

9. Related Documents ............................................................................................................................. 10

Summary of content (10 pages)

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HP-UX IPv6 Transition Mechanisms White Paper Table of Contents Table of Contents................................................................................................................... 1 1. Executive Summary............................................................................................................................... 2 2. Overview .............................................................................................................................................. 3 3.
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1. Executive Summary The Internet has evolved as a critical business communication medium; the current Internet Protocol (IPv4), which has been amazingly resilient so far, will not be able to support the continuous growth of the Internet indefinitely. The new emerging markets of nomadic personal computing devices, IP enabled devices and networked home entertainment require unique addressing, improved mobility and security. IPv4, though retrofitted to meet some of the needs, is fast reaching its limit.
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2. Overview Large-scale migration to any new technology is challenging and time consuming. IPv6 is no exception; its deployment is expected to be gradual. As IPv6 is being deployed, there will be a lengthy transition period during which IPv4 and IPv6 protocols will need to coexist. The IETF developed a number of transition mechanisms that will facilitate IPv6 deployment without impacting the existing installed base.
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Figure 1 illustrates the protocol stack in a dual stack node. The common transport layer components support two network layer components (IPv4 and IPv6), allowing applications on the node to communicate with both IPv4 and IPv6 applications. A dual stack node should be configured with both IPv4 and IPv6 addresses. Dual stack is the most straightforward technique that allows interoperation between IPv6 applications and IPv4 applications.
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IPv4 host IP6-in-IP tunnel IPv4 host IPv4 network IPv4 Router IPv4 Router IPv6/IPv4 host IPv6/IPv4 host Figure 2: host-to-host tunnel configuration IPv4 host 5.2 Router-to-Router In a router-to-router tunnel configuration, IPv6/IPv4 routers interconnected by an IPv4 infrastructure can tunnel IPv6 packets between themselves. In this case, the tunnel spans one segment of the end-to-end path the packet takes.
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IP6-in-IP tunnel IPv4 host IPv6 host IPv4 network IPv6/IPv4 Router IPv4 Router IPv6/IPv4 host IPv6 host Figure 4: router-to-host tunnel configuration IPv4 host 6. 6to4 6to4 is an automatic router-to-router tunneling mechanism that can be used to provide connectivity between isolated IPv6 sites or hosts across the IPv4 infrastructure and with IPv6-only sites via relay routers. Each 6to4 site should have a site border 6to4 (dual stack) router, which is one endpoint of the 6to4 automatic tunnel.
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Within the 6to4 site, the 6to4 router advertises the 6to4 prefix derived from its global IPv4 address. The 6to4 hosts in the site autoconfigure IPv6 addresses using the advertised 6to4 prefix and create a default route to the advertising 6to4 router. The 6to4 hosts within the 6to4 site communicate using IPv6 routing protocols. IPv6 communication with 6to4 hosts in a different 6to4 site is sent to the 6to4 router using the default route. The 6to4 router will encapsulate the IPv6 packets in an IPv4 header.
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. Deployment Scenario An organization is expanding its operations and starting a new branch office. The organization is short of globally unique IPv4 addresses and prefers not to use private IPv4 addresses. The organization decides to use IPv6 in the new branch office to take advantage of new IPv6 capabilities and to be in the forefront of new technology.
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Figure 7 illustrates the topology of the organization after setting up the new branch office and the required upgrades in the existing infrastructure.
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9. Related Documents [1] R. Hinden, S. Deering, “IP version 6 Addressing Architecture”, RFC 2373, July 1998. [2] R. Gilligan, S. Thomson, J. Bound, J. McCann, W. Stevens, "Basic Socket Interface Extensions for IPv6," RFC 3493, February 2003. [3] E. Nordmark, R. E. Gilligan, "Basic Transition Mechanisms for IPv6 Hosts and Routers," RFC 2893, August 2000. [4] Carpenter, B and Moore, K, “Connection of IPv6 Domains via IPv4 Clouds”, RFC 3056, February 2001. [5] HP-UX IPv6 Porting guide.