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TCP window scale option is needed for efficient transfer of data when the bandwidth-delay product (BDP) is greater than 64 KB [1].For instance, if a T1 transmission line of 1.5 Mbit/s was used over a satellite link with a 513 millisecond round-trip time (RTT), the bandwidth-delay product is ,, =, bits or about 96,187 bytes.
In computer networking, RWIN (TCP Receive Window) is the amount of data that a computer can accept without acknowledging the sender. If the sender has not received acknowledgement for the first packet it sent, it will stop and wait and if this wait exceeds a certain limit, it may even retransmit. This is how TCP achieves reliable data transmission.
A system administrator may adjust the maximum window size limit, or adjust the constant added during additive increase, as part of TCP tuning. The flow of data over a TCP connection is also controlled by the use of the receive window advertised by the receiver. A sender can send data less than its own congestion window and the receive window.
The difference is that bandwidth throttling regulates a bandwidth intensive device (such as a server) by limiting how much data that device can receive from each node / client or can output or can send for each response. Bandwidth capping on the other hand limits the total transfer capacity, upstream or downstream, of data over a medium.
This acknowledgement announces that the receiver is ready to receive n frames, beginning with the number specified. Both the sender and receiver maintain what is called a window. The size of the window is less than or equal to the buffer size. Sliding window flow control has far better performance than stop-and-wait flow control.
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The limit varies by vendor. For correct interoperation, frames should be no larger than the maximum frame size supported by any device on the network segment. [11] PPPoE v2: 1492 [12] Ethernet II MTU (1500) less PPPoE header (8); extensions exist DS-Lite over PPPoE 1452 Ethernet II MTU (1500) less PPPoE header (8) and IPv6 header (40) PPPoE ...
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