{"id":135,"date":"2005-07-21T22:52:00","date_gmt":"2005-07-21T22:52:00","guid":{"rendered":"http:\/\/markwilson.me.uk\/blog\/2005\/07\/ipv6-so-whats-it-all-about.htm"},"modified":"2007-07-16T23:38:12","modified_gmt":"2007-07-16T22:38:12","slug":"ipv6-so-whats-it-all-about","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2005\/07\/ipv6-so-whats-it-all-about.htm","title":{"rendered":"IPv6 &#8211; so what&#8217;s it all about?"},"content":{"rendered":"<p><!--112194538286713112-->A few weeks back, I was at a <a href=\"http:\/\/www.microsoft.com\/uk\/technet\/training\/events.mspx\">Microsoft TechNet UK event<\/a>, where <a href=\"http:\/\/blogs.technet.com\/steve_lamb\/\">Steve Lamb<\/a> discussed <a href=\"http:\/\/www.microsoft.com\/ipv6\/\">Microsoft&#8217;s implementation of the Internet Protocol v6<\/a> (IPv6), available in Windows 2000 service pack 3 or later, Windows XP service pack 1 or later, or Windows Server 2003. This is a new version of IP (also known as IP next generation &#8211; IPng), intended to overcome some of the limitations of the present version (v4), namely:<\/p>\n<ul>\n<li>Exhaustion of available addresses &#8211; not such a major issue now that network address translation (NAT) is so common, but potentially a future issue as more and more devices are IP-enabled.<\/li>\n<li>Large routing tables in backbone routers (the average ISP has 90,000 entries under IPv4).<\/li>\n<li>A need for simpler, stateless configuration.<\/li>\n<li>A need for better support of real-time data delivery (QoS)<\/li>\n<\/ul>\n<p>IPv6 provides a 128-bit address space (compared with IPv4&#8217;s 32-bit implementation), and instead of being represented using four octets in dotted decimal notation, IPv6 addresses use eight groups of four hexadecimal digits, which incorporate the media access control (MAC) address of the client, for example, 21DA:00D3:0000:2F3B:02AA:00FF:FE28:9C5A<\/p>\n<p>I&#8217;m told that there was an IPv5 (presumably with a 64-bit address space?), but it took too long to ratify. The IPv6 addressing scheme gives a vast number of possible combinations (about 340 undecillion &#8211; that&#8217;s more than 340000000000000000000000000000000000000!) and allows for faster routing due to its simplified header.<\/p>\n<p>Like most protocols in the TCP\/IP suite, IP is made up on an number of sub-protocols and IPv6 is actually formed of five core protocols:<\/p>\n<ul>\n<li>Internet protocol (IP).<\/li>\n<li>Internet control message protocol (ICMP).<\/li>\n<li>Multicast listener discovery (MLD).<\/li>\n<li>Neighbor discovery (ND).<\/li>\n<li>Top level aggregator (TLA).<\/li>\n<\/ul>\n<p>(Yes, there really is a three latter acronym called TLA!)<\/p>\n<p>In terms of application support, Microsoft&#8217;s IPv6 implementation is as per the IETF RFCs (i.e. not extended in any way). The tools look similar to the IPv4 versions, apart from the different addresses. DNS and RPC are both supported by the IPv6 stack, as are <a href=\"http:\/\/www.ietf.org\/rfc\/rfc2553.txt\">sockets interface extensions<\/a>; however IPSec on IPv6 is only partly functional. There is also support for an IPv6 IP Helper API.<\/p>\n<p>So what are the barriers to IPv6 adoption? For a start, businesses will need to see some benefit first, and although IPv6 addresses are available now, the initial worries about a lack of IPv4 addressing space have been alleviated (for the time being) with the use of network address translation (NAT) and private IP address ranges. Organisations implementing IPv6 do not need to drop IPv4 and convert overnight &#8211; it is possible to mix and match there is a <a href=\"http:\/\/www.6bone.net\/\">world-wide IPv6 test network backbone<\/a>; however, many organisations are using NAT as a line of defence in their security model and so firewall configurations will need to be re-examined if an IPv6 migration is performed. Add to that the fact that IPv4 is well understood by administration staff (IPv6 is not), a critical mass must build up before most organisations will be ready to make the move, although the <a href=\"http:\/\/it.slashdot.org\/article.pl?sid=05\/07\/02\/095205&amp;tid=230&#038;tid=103&amp;tid=218\">the US government is mandating that all federal agencies must use IPv6 by 2008<\/a> &#8211; maybe that will start the ball rolling.<\/p>\n<p>In summary, IPv6 is here today, but many organisations will not be in a rush to migrate. The next generation of Windows (codenamed Longhorn) is expected to include a new networking stack that supports both the IPv6 and IPv4 networking standards and I would expect IPv6 to gain some momentum around about the time of it&#8217;s expected release (2006-7). Until then, IPv6 will remain something to look at in our labs. <a href=\"http:\/\/en.wikipedia.org\/wiki\/IPv6\">Wikipedia has more information about IPv6<\/a> for those who wish to learn more.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A few weeks back, I was at a Microsoft TechNet UK event, where Steve Lamb discussed Microsoft&#8217;s implementation of the Internet Protocol v6 (IPv6), available in Windows 2000 service pack 3 or later, Windows XP service pack 1 or later, or Windows Server 2003. This is a new version of IP (also known as IP &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2005\/07\/ipv6-so-whats-it-all-about.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">IPv6 &#8211; so what&#8217;s it all about?<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[45],"class_list":["post-135","post","type-post","status-publish","format-standard","hentry","tag-tcpip"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>IPv6 - so what&#039;s it all about? - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2005\/07\/ipv6-so-whats-it-all-about.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"IPv6 - so what&#039;s it all about? - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"A few weeks back, I was at a Microsoft TechNet UK event, where Steve Lamb discussed Microsoft&#8217;s implementation of the Internet Protocol v6 (IPv6), available in Windows 2000 service pack 3 or later, Windows XP service pack 1 or later, or Windows Server 2003. 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Some are likening the \"IPocalypse\" to the Year 2000 bug. Others say it's a non-issue. So what\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1165,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/08\/microsoft-infrastructure-architecture-considerations-part-6-high-availability.htm","url_meta":{"origin":135,"position":1},"title":"Microsoft infrastructure architecture considerations: part 6 (high availability)","author":"Mark Wilson","date":"Wednesday 27 August 2008","format":false,"excerpt":"In this instalment of the series of posts on the architectural considerations for designing a predominantly-Microsoft IT infrastructure, based on the MCS Talks: Enterprise Infrastructure series, I\u00e2\u20ac\u2122ll look at some of the architecture considerations relating to providing high availability through redundancy in the infrastructure. The whole point of high availability\u2026","rel":"","context":"In \"Architecture\"","block_context":{"text":"Architecture","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/architecture"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2548,"url":"https:\/\/www.markwilson.co.uk\/blog\/2011\/06\/useful-links-june-2011.htm","url_meta":{"origin":135,"position":2},"title":"Useful Links: June 2011","author":"Mark Wilson","date":"Thursday 30 June 2011","format":false,"excerpt":"A list of items I've come across recently that I found potentially useful, interesting, or just plain funny: Amazon price tracker - Track prices over time and buy at a target price (via Garry Martin) Facebook guide for parents Column Five Media Infographics - Lots of nice infographics here... World\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1276,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/11\/ready-for-an-xtremely-technical-seminar-on-windows-server-2008.htm","url_meta":{"origin":135,"position":3},"title":"Ready for an Xtremely Technical seminar on Windows Server 2008?","author":"Mark Wilson","date":"Wednesday 5 November 2008","format":false,"excerpt":"I've always been impressed with John Craddock and Sally Storey's presentations on Active Directory and related topics so, a couple of weeks back, I was pleased to catch up with them as they presented at the inaugural meeting of the Active Directory User Group. 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Presented by Andy Malone from Quality Training, I've already given my (negative, but hopefully\u2026","rel":"","context":"In \"Microsoft Windows Server 2008\"","block_context":{"text":"Microsoft Windows Server 2008","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/windows-server-2008"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1566,"url":"https:\/\/www.markwilson.co.uk\/blog\/2009\/12\/john-craddock-whiteboards-directaccess-and-active-directory-recycle-bin.htm","url_meta":{"origin":135,"position":5},"title":"John Craddock whiteboards DirectAccess and Active Directory Recycle Bin","author":"Mark Wilson","date":"Tuesday 1 December 2009","format":false,"excerpt":"I spent yesterday evening at an Active Directory User Group (ADUG) meeting where John Craddock presented on IPv6 and DirectAccess (repeating two of John's TechEd Europe 2009 sessions).\u00c2\u00a0 I have to admit that, at times, I struggled to keep up as the technology went deep but it was extremely worthwhile.\u00c2\u00a0\u2026","rel":"","context":"In \"Microsoft Active Directory\"","block_context":{"text":"Microsoft Active Directory","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/active-directory"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=135"}],"version-history":[{"count":0,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/135\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}