>> 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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