{"id":1528,"date":"2019-01-28T23:31:33","date_gmt":"2019-01-28T23:31:33","guid":{"rendered":"https:\/\/live-infoblox-blog.pantheonsite.io\/?p=1528"},"modified":"2024-02-21T11:57:05","modified_gmt":"2024-02-21T19:57:05","slug":"the-history-of-dns-flag-day","status":"publish","type":"post","link":"https:\/\/www.infoblox.com\/blog\/company\/the-history-of-dns-flag-day\/","title":{"rendered":"The History of DNS Flag Day"},"content":{"rendered":"

The Domain Name System<\/a> has been around for over 30 years now, since the days of the ARPANET, the precursor to the Internet.\u00a0 DNS is remarkable:\u00a0 It\u2019s scaled from serving a network of thousands of computers to a network of billions of computers and other devices.\u00a0 It\u2019s decentralized, made up of millions of cooperating resolvers and DNS servers, yet it (usually) provides rapid resolution of arbitrary domain names from all over the globe.<\/p>\n

\"The<\/p>\n

There are dozens of makes and models of DNS servers, and as you might guess, not all of them implement all aspects of the DNS specifications equally well.\u00a0 Take, for instance, EDNS0, which specifies extension mechanisms to DNS, notably the use of larger DNS messages over UDP, the User Datagram Protocol.<\/p>\n

Despite the fact that EDNS0 was written in 1999, 20 years ago, there are some DNS servers that don\u2019t support it correctly.\u00a0 EDNS0\u2019s specifications say that, if a DNS server that doesn\u2019t support EDNS0 receives a query with EDNS0 options in it, it\u2019s supposed to respond with a standard DNS response code called a \u201cFormat Error.\u201d\u00a0 Unfortunately, some DNS servers respond instead with a \u201cNot Implemented\u201d or \u201cServer Failed\u201d response code, or simply don\u2019t respond at all.<\/p>\n

It\u2019s that last case that\u2019s particularly troublesome, because to accommodate those DNS servers, a recursive DNS server that queries an authoritative DNS server but doesn\u2019t get a response must consider the case that the authoritative DNS server a) doesn\u2019t support EDNS0 and b) is one of the few that simply doesn\u2019t respond at all to queries with EDNS0 options.\u00a0 Until recently, almost all recursive DNS servers accommodated this small percentage of misbehaving DNS servers by retransmitting the same query without EDNS0 options to an unresponsive DNS server.<\/p>\n

But what if the unresponsive DNS server didn\u2019t respond because it was down, or because its IP address was wrong in DNS, or for some other reason?\u00a0 Well, your recursive DNS server would still retransmit a query to it, rather than quickly moving along to a different authoritative DNS server, and your resolution performance would suffer.<\/p>\n

It seems a little silly to penalize everyone on the Internet for the sake of a few DNS server implementations out there that can\u2019t be bothered to support a 20-year-old extension to DNS.\u00a0 (In the words of a famous philosopher, \u201cThe needs of the many outweigh the needs of the few.\u201d)\u00a0 That\u2019s what DNS Flag Day is all about.\u00a0 A group of developers of popular DNS servers said, \u201cEnough!\u201d and announced that as of February 1st<\/sup>, they start tearing out the mechanism that accommodated these old DNS servers at the expense of the rest of the Internet.<\/p>\n

Now this won\u2019t happen overnight.\u00a0 The latest versions of software from these developers will incorporate these changes, but it\u2019ll take time before everyone upgrades to new versions of these DNS servers.\u00a0 For example, here at Infoblox, we track the Internet Systems Consortium\u2019s extended release versions of BIND, and there won\u2019t be one that includes this change for some time.\u00a0 Even then, it\u2019ll take time for us to test it and integrate it into our products.\u00a0 But the good news is that before long\u2014or in the foreseeable future, anyway\u2014DNS resolution will speed up for most of the Internet.<\/p>\n","protected":false},"excerpt":{"rendered":"

The Domain Name System has been around for over 30 years now, since the days of the ARPANET, the precursor to the Internet.\u00a0 DNS is remarkable:\u00a0 It\u2019s scaled from serving a network of thousands of computers to a network of billions of computers and other devices.\u00a0 It\u2019s decentralized, made up of millions of cooperating resolvers […]<\/p>\n","protected":false},"author":178,"featured_media":1529,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[1],"tags":[99,16,15],"class_list":{"0":"post-1528","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-company","8":"tag-dns-flag-day","9":"tag-infoblox","10":"tag-security","11":"entry"},"acf":[],"yoast_head":"\nThe History of DNS Flag Day<\/title>\n<meta name=\"description\" content=\"The Domain Name System has been around for over 30 years now, since the days of the ARPANET, the precursor to the Internet. 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