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TCP Overview window 199
Models 2616RC, 3096RC & 3196RC Admin Reference Guide 12 • IP (IP, TCP, UDP, & ICMP)
Details… hyperlink
Click on the Details… link (see figure 111 on page 198) to display the TCP Details window. The TCP Details
window is described in section “TCP Details window” on page 200.
TCP Parameters
The following sections describe the parameters displayed on the TCP Overview window.
Retransmit-Timeout Algorithm (tcpRtoAlgorithm)
Indicates the algorithm the TCP subsystem uses to calculate the TCP retransmission timer delay. The TCP
retransmission timer defines how long the T-DAC will wait before 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.
Maximum Connections (tcpMaxConn)
The limit on the total number of TCP connections the entity can support. In entities where the maximum
number of connections is dynamic, this object should contain the value -1.
TCP Statistics
The following sections describe the statistics displayed on the TCP Overview window.
Active Opens (tcpActiveOpens)
The number of times TCP connections have made a direct transition to the SYN-SENT state from the
CLOSED state.
Passive Opens (tcpPassiveOpens)
The number of times TCP connections have made a direct transition to the SYN-RCVD state from the LIS-
TEN state.
Attempt/Fails (tcpAttemptFails)
The number of times TCP connections have made a direct transition to the CLOSED state from either the
SYN-SENT state or the SYN-RCVD state, plus the number of times TCP connections have made a direct
transition to the LISTEN state from the SYN-RCVD state.
ESTABLISHED Resets (tcpEstabResets)
The number of times TCP connections have made a direct transition to the CLOSED state from either the
ESTABLISHED state or the CLOSE-WAIT state.