OID value: 1.3.6.1.2.1.6.9
OID description:
tcpCurrEstab OBJECT-TYPE SYNTAX Gauge ACCESS read-only STATUS mandatory DESCRIPTION "The number of TCP connections for which the current state is either ESTABLISHED or CLOSE- WAIT." ::= { tcp 9 }
See also the OID Repository website reference for 1.3.6.1.2.1.6.9