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Total application of Ethernet technology leads to redundancy of protocols TCP, UDP, IP. But Ethernet MAC-addresses are plain which impedes their usage in world-wide networks. This paper describes E6 Addressing Scheme and Network Architecture which uses uniform E6 address with the length of 6 octets and hierarchic structure.〔(Zaitsev D.A. ), Bolshakov S.I. (E6 Addressing Scheme and Network Architecture, Journal of Advanced Computer Science and Technology, 1 (1) (2012) 18-31 ).〕 E6 addresses are put into the MAC-addresses fields of Ethernet frame as well as used at the application level. Ethernet LLC facilities are employed for guaranteed delivery of information. == Historical Notes == In heterogeneous networks TCP/IP protocols played their uniting part based on the mapping of IP-addresses into physical addresses of various technologies. Moreover, while physical networks were unreliable and did not provide facilities of guaranteed delivery, TCP played its central part in the reliable delivery of information over unreliable channels. The cost of this approach is overhead caused by TCP/UDP and IP headers, slow algorithms of TCP sliding window, inevitable expense of resources for mapping of addresses (ARP, RARP for IPoverEthernet ). The lack of IP-addresses caused the development of NAT and IPv6 standards. NAT facilities are widely used but lead to expenses caused by additional mapping of IP-addresses. IPv6 is too cumbersome which hampers its practical usage. IEEE tries to overcome the limitations of scale for Ethernet networks caused by plain MAC-address structure with its new standards IEEE 802.1ah (Provider Backbone Bridge). The solution is based on duplicate pairs of customer and backbone MAC-addresses and additional mapping of addresses. Such an incremental approach could require triple pairs of MAC-addresses in future. Recently, Ethernet-adaptors and interfaces of Ethernet switches allow the substitution of the vendor MAC-address by an arbitrary MAC-address which creates conditions for new addressing schemes development. 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「Network Protocol Stack E6」の詳細全文を読む スポンサード リンク
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