Use the TCP attribute group to monitor the status of the TCP connection. The Management Information Base (MIB-II) detailed in RFC1213, for use with network management protocols in TCP/IP-based internets, establishes and defines the attributes of this group.
The TCP attributes are available for the SNMP Data Provider.
Agent Name Identifies the SNMP host name relating to a particular sample of data. A valid entry is an alphanumeric text string, with a maximum length of 64 characters.
tcpActiveOpens The number of times TCP connections have made a direct transition to the SYN-SENT state from the CLOSED state. A valid entry is an integer of up to four digits.
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. A valid entry is an integer of up to four digits.
tcpCurrEstab The number of TCP connections for which the current state is either ESTABLISHED or CLOSE- WAIT. A valid entry is an integer of up to four digits.
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. A valid entry is an integer of up to four digits.
tcpInSegs The total number of segments received, including those received in error. This count includes segments received on currently established connections. A valid entry is an integer of up to four digits.
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. A valid entry is an integer of up to four digits.
tcpOutSegs The total number of segments sent, including those on current connections but excluding those containing only retransmitted octets. A valid entry is an integer of up to four digits.
tcpPassiveOpens The number of times TCP connections have made a direct transition to the SYN-RCVD state from the LISTEN state. A valid entry is an integer of up to four digits.
tcpRetransSegs The total number of segments retransmitted; that is, the number of TCP segments transmitted containing one or more previously transmitted octets. A valid entry is an integer of up to four digits.
tcpRtoAlgorithm The algorithm used to determine the timeout value used for retransmitting unacknowledged octets. A valid entry is an alphanumeric text string, with a maximum length of 64 characters. Possible values include:
1 = other
2 = constant
3 = rsre
4 = vanj
tcpRtoMax The maximum value permitted by a TCP implementation for the retransmission timeout, measured in milliseconds. More refined semantics for objects of this type depend on 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. A valid entry is an integer of up to four digits.
tcpRtoMin The minimum value permitted by a TCP implementation for the retransmission timeout, measured in milliseconds. More refined semantics for objects of this type depend on 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. A valid entry is an integer of up to four digits.