All MIBs › ZTE-AN-SECURITY-L3-MIB › zxAnSecL3TcpHalfOpenConns
zxAnSecL3TcpHalfOpenConns
Module: ZTE-AN-SECURITY-L3-MIB
OID (symbolic): ZTE-AN-SECURITY-L3-MIB::zxAnSecL3TcpHalfOpenConns
OID (numeric): 1.3.6.1.4.1.3902.1082.70.37.2.3.1.1.22
Node type: OBJECT-TYPE
Type: Integer32
Access: read-only
Description: Number of TCP half-open connections that cannot be established.
What is zxAnSecL3TcpHalfOpenConns?
This read-only counter reports the current number of TCP connections stuck in the half-open (SYN-RCVD) state that have not completed their three-way handshake. Admins monitor it directly, and via its ratio to zxAnSecL3TcpTotalConns, as the primary real-time signal of a SYN-flood attack in progress. For example, a rapid rise in zxAnSecL3TcpHalfOpenConns while zxAnSecL3TcpTotalConns stays flat strongly suggests an attacker is sending SYN packets without completing connections.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.3902.1082.70.37.2.3.1.1.22 snmpwalk -v2c -c public <target> ZTE-AN-SECURITY-L3-MIB::zxAnSecL3TcpHalfOpenConns
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.3902.1082.70.37.2.3.1.1.22.1 snmpget -v2c -c public <target> ZTE-AN-SECURITY-L3-MIB::zxAnSecL3TcpHalfOpenConns.1
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OID Breakdown
Upper-level ancestors (9 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 |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| 1.3.6.1.4.1.3902 | zte | DPI-MIB |
| 1.3.6.1.4.1.3902.1082 | zxAccessNode | ZTE-AN-SMI |
| 1.3.6.1.4.1.3902.1082.70 | zxAnServiceSecurity | ZTE-AN-SMI |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.3902.1082.70.37 | zxAnSecurityL3Mib | ZTE-AN-SECURITY-L3-MIB |
| 1.3.6.1.4.1.3902.1082.70.37.2 | zxAnSecL3Objects | ZTE-AN-SECURITY-L3-MIB |
| 1.3.6.1.4.1.3902.1082.70.37.2.3 | zxAnSecL3TcpObjects | ZTE-AN-SECURITY-L3-MIB |
| 1.3.6.1.4.1.3902.1082.70.37.2.3.1 | zxAnSecL3TcpGlobalObjects | ZTE-AN-SECURITY-L3-MIB |
| 1.3.6.1.4.1.3902.1082.70.37.2.3.1.1 | zxAnSecL3TcpSynFloodGlbObjects | ZTE-AN-SECURITY-L3-MIB |
| 1.3.6.1.4.1.3902.1082.70.37.2.3.1.1.22 | zxAnSecL3TcpHalfOpenConns | ZTE-AN-SECURITY-L3-MIB |