>> MIB - Management Information Base

>> Table: tcp - (.1.3.6.1.2.1.6)

tcp
OIDNameTypeAccess
.1RtoAlgorithmENUMR
.2RtoMinINTEGERR
.3RtoMaxINTEGERR
.4MaxConnINTEGERR
.5ActiveOpensCounterR
.6PassiveOpensCounterR
.7AttemptFailsCounterR
.8EstabResetsCounterR
.9CurrEstabGaugeR
.10InSegsCounterR
.11OutSegsCounterR
.12RetransSegsCounterR
.14InErrsCounterR
.15OutRstsCounterR

RtoAlgorithm
The algorithm used to determine the timeout value
used for retransmitting unacknowledged octets.
Enumerations:
  • other (1)
  • constant (2)
  • rsre (3)
  • vanj (4)
RtoMin
The minimum value permitted by a TCP
implementation for the retransmission timeout,
measured in milliseconds.  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.
other(1)	= none of the following;
constant(2)	= a constant rto;
rsre(3)	= MIL-STD-1778, Appendix B;
vanj(4)       = Van Jacobson's algorithm [10]
RtoMax
The maximum value permitted by a TCP
implementation for the retransmission timeout,
measured in milliseconds.  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.
MaxConn
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.
ActiveOpens
The number of times TCP connections have made a
direct transition to the SYN-SENT state from the
CLOSED state.
PassiveOpens
The number of times TCP connections have made a
direct transition to the SYN-RCVD state from the
LISTEN state.
AttemptFails
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.
EstabResets
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.
CurrEstab
The number of TCP connections for which the
current state is either ESTABLISHED or 
CLOSE-WAIT.
InSegs
The total number of segments received, including
those received in error.  This count includes
segments received on currently established
connections.
OutSegs
The total number of segments sent, including
those on current connections but excluding those
containing only retransmitted octets.
RetransSegs
The total number of segments retransmitted - that
is, the number of TCP segments transmitted
containing one or more previously transmitted
octets.
InErrs
The total number of segments received in error
(e.g., bad TCP checksums).
OutRsts
The number of TCP segments sent containing the
RST flag.


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