窗口服務器2008年提高網絡-下一代TCP/IP堆
窗口服務器2008年包括新的實施(完全再設計叫的)原始的TCP/IP協議猝下一代TCP/IP堆。 這個新的框架是TCP/IP功能全面重寫為IPv4和IPv6。 它設計使用各種各樣的網絡技術改善集會連通性和性能需要以各種各樣的網絡環境。
為在一個洞困住的那些的目的在巴塔哥尼亞從80年代初期， TCP/IP是事實上的標準網絡協議猝為您將遇到的多數服務器和工作站計算機，但它绝不是只那個。 它擴展到傳輸控制協議或互聯網協議并且起基礎作用對於橫跨互聯網穿梭的網絡信息流通量。 它成為幾乎普遍手段為所有種類的網絡的通信。
改進核心網絡堆框架并且被提高增加現有的功能，補全它以提高功能的補充表現和通過另外的特點和組分進一步擴展那個框架。 下列是物質的在下一代TCP/IP網絡協議猝直接地和間接地與前進有關在窗口服務器2008年。
接受窗口自動調整
在TCP，接受窗口大小定義了TCP接收器允許TCP發令者推擠網絡在要求發令者之前等待它的收據的承認的相當數量數據。 正確地確定最大值接受窗口大小為連接自動地現在被處理接受窗口自動調整，使用實時帶寬演算連續確定優選的窗口大小根據每連接依據。
在數據傳送期間，改善接受窗口生產量增量網絡帶寬運用。 如果所有接收器為TCP數據被優選，服務質量(QoS)可能幫助減少壅塞為經營在或者靠近容量的網絡。
服務質量(省略的QoS)提到能力塑造和控制持續的網絡通信服務的特徵。 這個想法動手術在無論如何可以被測量，改進傳輸和誤差率的概念(與其他交通特徵一起)和被保證-在某種程度上。
複合TCP
下一代TCP/IP網絡堆也對待與大連接接受窗口大小，并且大帶寬延遲配製TCP (CTCP)，通過監測當前交通情況進取地增加在實時送的相當數量數據的作用。
CTCP也保證它不消極地衝擊其他現有的TCP連接，并且補全接受窗口自動調整的支持提供堅固表現獲取看得出在任何高延遲，高生產量網絡環境。
明確壅塞通知支持
Lost TCP segments are assumed to be lost, probably owing to router congestion, which triggers a congestion control mechanism that dramatically reduces a TCP sender’s transmission rate. With Explicit Congestion Notification (ECN; see RFC 3168, which you can find at www.faqs.org/rfcs/rfc3168.html) support, both TCP peers and routers experiencing congestion accordingly mark packets they forward. On receipt of such packets, a TCP peer will scale back its transmission rate to ease congestion and reduce segment loss. Windows Server 2008 now includes core support for this protocol feature.
Quality of Service (QoS) support
Windows Server 2003 and Windows XP provide QoS functionality to applications through QoS APIs, which are leveraged to prioritize time-sensitive network data delivery functions. Windows Server 2008 and Windows Vista include new facilities for network traffic management on Windows networks so that high-priority traffic is handled first, which helps with streaming media, voice over IP, video conferencing, and other applications where quick response times are needed.
Policy-based QoS for enterprise networks allows IT staff to either prioritize or manage the send rate for outbound connections, which can be confined to applications, source/destination IPv4 or IPv6 addresses, and source/destination or a range of ports.
Enhancements for high-loss environments
The Next Generation TCP/IP stack also improves network conditions in highloss environments through several optimization features that include:
• (RFC 2582) The NewReno Modification to TCP’s Fast Recovery Algorithm: The NewReno algorithm provides faster throughput by changing the way a sender can increase its sending rate when multiple segments in a given window are lost, and the sender receives partial acknowledgement only for segments actually received.
• (RFC 2883) An Extension to Selective Acknowledgement (SACK) Option for TCP: SACK allows a receiver to determine when it has retransmitted a segment unnecessarily and adjust its behavior on-the-fly to prevent further unnecessary retransmissions. Fewer retransmissions result in more optimal overall delivery.
• (RFC 3517) A Conservative Selective Acknowledgement (SACK)-based Loss Recovery Algorithm for TCP: Windows Server 2003 and Windows XP use SACK information only to determine those TCP segments that have yet to arrive. Windows Server 2008 includes a method defined in
• RFC 3517 to use SACK information for loss recovery in the event duplicate acknowledgements are received, which is maintained on a perconnection basis by the Next Generation TCP/IP stack.
• (RFC 4138) Forward RTO-Recovery (F-RTO): Spurious retransmissions can occur as a result of increases in round trip time (RTT). The F-RTO algorithm prevents unnecessary retransmissions, particularly in wireless environments where client adapters may roam from point to point, to return quickly to normal send rates.
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Source of Information : For Dummies Windows Server 2008 For Dummies
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