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Optionally , a TCP MAY set the restart window to the minimum of the value used for the initial window and the current value of cwnd ( in other words , using a larger value for the restart window should never increase the size of cwnd ) . This increased initial window is optional : a TCP MAY start with a larger initial window . The TCP Bandwidth Delay Product Limiting is similar to TCP / Vegas in NetBSD . We focus on changes to the additive increase element of the TCP AIMD algorithm . Note that Van Jacobson header compression [ 10 ] will not function properly unless all TCP IP datagrams to and from the mobile node pass , respectively , through the same first and last-hop router . To achieve this , BEEP re-introduces a mechanism used by the TCP : window-based flow control - - each channel has a sliding window that indicates the number of payload octets that a peer may transmit before receiving further permission .