12 • TCP '6/'$&6$GPLQLVWUDWRUVª5HIHUHQ H*XLGH84 ,QWURGX WLRQIntroductionTransmission Control Protocol (TCP) is in the Transport layer of the OSI model and sits on top of IP. It is oneof the more widely used protocols among the TCP/IP suite. The TCP subsystem web pages of the 3092DACS provides management and statistical information on TCP. Detailed information regarding the SNMPMIB variables may be downloaded from RFC1213: Management Information Base for Network Managementof TCP/IP-based internets: MIB-II.Click on 7&3 under the &RQILJXUDWLRQ0HQX to display the 7&3 main window (see figure 31) to monitor TCPstatistics.)LJXUH7&3PDLQZLQGRZTCP main windowRetransmit-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 theretransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has thesemantics 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 theretransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has thesemantics of the UBOUND quantity described in RFC 793.
