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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Extension mechanisms for DNS ： ウィキペディア英語版 Extension mechanisms for DNS Extension mechanisms for DNS (EDNS) is a specification for expanding the size of several parameters of the Domain Name System (DNS) protocol which had size restrictions that the Internet engineering community deemed too limited for increasing functionality of the protocol. The first set of extensions was published in 1999 by the Internet Engineering Task Force as RFC 2671, also known as EDNS0.〔RFC 2671, ''Extension Mechanisms for DNS (EDNS0)'', P. Vixie, The Internet Society (August 1999)〕 ==Motivation== The Domain Name System was first developed in the early 1980s, since which time it has been progressively enhanced with new features, while maintaining compatibility with earlier versions of the protocol. The restrictions in size of several flags fields, return codes and label types available in the basic DNS protocol were not sufficient to support some desirable features. Moreover, DNS messages carried by UDP were restricted to 512 bytes, not considering the Internet Protocol (IP) and transport layer headers.〔RFC 1035, ''Domain Names - Implementation and Specification'', P. Mockapetris (November 1987)〕 Resorting to a virtual circuit transport, using the Transmission Control Protocol (TCP), would greatly increase overhead. This presented a major obstacle to adding new features to DNS. In 1999, Paul Vixie proposed extending DNS to allow for new flags and response codes, and to provide support for longer responses in a framework that is backwards compatible with previous implementations. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Extension mechanisms for DNS」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.