Patton electronics 3092, Administrator'S Reference Manual

Page: 86 / 162

12 • TCP
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Introduction
Transmission Control Protocol (TCP) is in the Transport layer of the OSI model and sits on top of IP. It is one
of the more widely used protocols among the TCP/IP suite. The TCP subsystem web pages of the 3092
DACS provides management and statistical information on TCP. Detailed information regarding the SNMP
MIB variables may be downloaded from RFC1213: Management Information Base for Network Management
of TCP/IP-based internets: MIB-II.
Click on
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under the
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to display the
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main window (see figure 31) to monitor TCP
statistics.
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TCP main window
Retransmit-Timeout Algorithm (tcpRtoAlgorithm)
The algorithm that determines the timeout value used for retransmitting unacknowledged octets.
Retransmit-Timeout Minimum (tcpRtoMin)
The minimum value permitted by a TCP implementation for the retransmission timeout, measured in milli-
seconds. More refined semantics for objects of this type depend upon the algorithm used to determine the
retransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has the
semantics of the LBOUND quantity described in RFC 793.
Retransmit-Timeout Maximum (tcpRtoMax)
The maximum value permitted by a TCP implementation for the retransmission timeout, measured in milli-
seconds. More refined semantics for objects of this type depend upon the algorithm used to determine the
retransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has the
semantics of the UBOUND quantity described in RFC 793.