TCP-ESTATS-MIB :: tcpEStatsAppSndUna

MIB Reference — IPNetwork Monitor · Updated October 06, 2026

All MIBs › TCP-ESTATS-MIB › tcpEStatsAppSndUna

tcpEStatsAppSndUna

Module: TCP-ESTATS-MIB

OID (symbolic): TCP-ESTATS-MIB::tcpEStatsAppSndUna

OID (numeric): 1.3.6.1.2.1.156.1.1.6.1.1

Node type: OBJECT-TYPE

Type: Counter32

Access: read-only

Description: The value of SND.UNA, the oldest unacknowledged sequence number.

Note that SND.UNA is a TCP state variable that is congruent to Counter32 semantics.

What is tcpEStatsAppSndUna?

The value of SND.UNA, the oldest byte sent but not yet acknowledged; marks the left edge of the connection's outstanding, in-flight, data.

Examples

Walk all instances (SNMPv2c):

snmpwalk -v2c -c public <target> 1.3.6.1.2.1.156.1.1.6.1.1
snmpwalk -v2c -c public <target> TCP-ESTATS-MIB::tcpEStatsAppSndUna

Get a specific instance (index 1):

snmpget -v2c -c public <target> 1.3.6.1.2.1.156.1.1.6.1.1.1
snmpget -v2c -c public <target> TCP-ESTATS-MIB::tcpEStatsAppSndUna.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::tcpEStatsAppSndUna 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 OIDNameModule
1isoLANART-AGENT
1.3orgAirPair-MIB
1.3.6dodAirPair-MIB
1.3.6.1internetAirPair-MIB
1.3.6.1.2mgmtAPERTUS-NPG-MIB
1.3.6.1.2.1mib_2AXON-MIB
Numeric OIDNameModule
1.3.6.1.2.1.156tcpEStatsMIBTCP-ESTATS-MIB
1.3.6.1.2.1.156.1tcpEStatsMIBObjectsTCP-ESTATS-MIB
1.3.6.1.2.1.156.1.1tcpEStatsTCP-ESTATS-MIB
1.3.6.1.2.1.156.1.1.6tcpEStatsAppTableTCP-ESTATS-MIB
1.3.6.1.2.1.156.1.1.6.1tcpEStatsAppEntryTCP-ESTATS-MIB
1.3.6.1.2.1.156.1.1.6.1.1tcpEStatsAppSndUnaTCP-ESTATS-MIB