January 2008
Intermediate to advanced
624 pages
14h 16m
English
Content preview from Windows Server® 2008 TCP/IP Protocols and ServicesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Calculating the RTO
The determination of the RTO is an important function of TCP. The RTO must be adjusted to the internetwork’s changing conditions. If the determined RTO is less than the RTT, segments are unnecessarily retransmitted.
In RFC 793, the suggested method of computing the RTO—known as the smoothed round-trip time (SRTT)—is based on the following formulas:
SRTT = (α*SRTT) + ((1-α)*RTT) RTO = min[UpperBound, max[LowerBound,(β*SRTT)]]
Thus, the new RTO is based on the determination of the current RTT, the previous SRTT, a smoothing factor (α), and a variance factor (β) . In practice, this formula was found to be inadequate in determining the RTO in an environment in which the RTT changed suddenly. Instead, RFC 1122 states that TCP must ...
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