All MIBs › TCP-ESTATS-MIB › tcpEStatsListenerSynRcvd
tcpEStatsListenerSynRcvd
Module: TCP-ESTATS-MIB
OID (symbolic): TCP-ESTATS-MIB::tcpEStatsListenerSynRcvd
OID (numeric): 1.3.6.1.2.1.156.1.1.1.1.2
Node type: OBJECT-TYPE
Type: ZeroBasedCounter32
Access: read-only
Description: The number of SYNs which have been received for this listener. The total number of failed connections for all reasons can be estimated to be tcpEStatsListenerSynRcvd minus tcpEStatsListenerAccepted and tcpEStatsListenerCurBacklog.
What is tcpEStatsListenerSynRcvd?
Count of SYNs received by this listener; subtracting tcpEStatsListenerAccepted and tcpEStatsListenerCurBacklog from this estimates how many incoming connection attempts failed for any reason - useful for spotting a SYN flood or an overloaded listen backlog.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.2.1.156.1.1.1.1.2 snmpwalk -v2c -c public <target> TCP-ESTATS-MIB::tcpEStatsListenerSynRcvd
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.2.1.156.1.1.1.1.2.1 snmpget -v2c -c public <target> TCP-ESTATS-MIB::tcpEStatsListenerSynRcvd.1
Start monitoring vendor-neutral, standards-based MIB, hosts/servers/network devices running a TCP/IP stack (extended TCP performance diagnostics) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the TCP-ESTATS-MIB::tcpEStatsListenerSynRcvd OID value, configure state conditions and alerts, and monitor any vendor-neutral, standards-based MIB, hosts/servers/network devices running a TCP/IP stack (extended TCP performance diagnostics) from a single console.
OID Breakdown
Upper-level ancestors (6 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.2 | mgmt | APERTUS-NPG-MIB |
| 1.3.6.1.2.1 | mib_2 | AXON-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.2.1.156 | tcpEStatsMIB | TCP-ESTATS-MIB |
| 1.3.6.1.2.1.156.1 | tcpEStatsMIBObjects | TCP-ESTATS-MIB |
| 1.3.6.1.2.1.156.1.1 | tcpEStats | TCP-ESTATS-MIB |
| 1.3.6.1.2.1.156.1.1.1 | tcpEStatsListenerTable | TCP-ESTATS-MIB |
| 1.3.6.1.2.1.156.1.1.1.1 | tcpEStatsListenerEntry | TCP-ESTATS-MIB |
| 1.3.6.1.2.1.156.1.1.1.1.2 | tcpEStatsListenerSynRcvd | TCP-ESTATS-MIB |