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История изменений

Исправление Shulman, (текущая версия) :

порт слушается

[root@snmp-host user]# netstat -npa | grep snmp
tcp        0      0 127.0.0.1:199           0.0.0.0:*               LISTEN      50286/snmpd
udp        0      0 0.0.0.0:161             0.0.0.0:*                           50286/snmpd
unix  3      [ ]         STREAM     CONNECTED     374135   50286/snmpd
unix  2      [ ]         DGRAM                    374192   50286/snmpd

snmpd жива

[root@snmp-host user]# systemctl status snmpd
● snmpd.service - Simple Network Management Protocol (SNMP) Daemon.
     Loaded: loaded (/usr/lib/systemd/system/snmpd.service; enabled; vendor preset: disabled)
     Active: active (running) since Sat 2021-11-06 10:13:42 MSK; 5s ago
   Main PID: 50286 (snmpd)
      Tasks: 1 (limit: 1123)
     Memory: 4.4M
        CPU: 52ms
     CGroup: /system.slice/snmpd.service
             └─50286 /usr/sbin/snmpd -LS0-6d -f

ноя 06 10:13:42 snmp-host systemd[1]: Starting Simple Network Management Protocol (SNMP) Daemon....
ноя 06 10:13:42 snmp-host snmpd[50286]: NET-SNMP version 5.9
ноя 06 10:13:42 snmp-host systemd[1]: Started Simple Network Management Protocol (SNMP) Daemon..

То что вы спрашивали не работает

[root@snmp-host user]# snmpwalk localhost
snmpwalk: No securityName specified
[root@snmp-host user]# snmpwalk -v 2c -c public -O e localhost
Timeout: No Response from localhost

Исходная версия Shulman, :

порт слушается

[root@snmp-host user]# netstat -npa | grep snmp
tcp        0      0 127.0.0.1:199           0.0.0.0:*               LISTEN      50286/snmpd
udp        0      0 0.0.0.0:161             0.0.0.0:*                           50286/snmpd
unix  3      [ ]         STREAM     CONNECTED     374135   50286/snmpd
unix  2      [ ]         DGRAM                    374192   50286/snmpd

snmpd жива

[root@snmp-host user]# systemctl status snmpd
● snmpd.service - Simple Network Management Protocol (SNMP) Daemon.
     Loaded: loaded (/usr/lib/systemd/system/snmpd.service; enabled; vendor preset: disabled)
     Active: active (running) since Sat 2021-11-06 10:13:42 MSK; 5s ago
   Main PID: 50286 (snmpd)
      Tasks: 1 (limit: 1123)
     Memory: 4.4M
        CPU: 52ms
     CGroup: /system.slice/snmpd.service
             └─50286 /usr/sbin/snmpd -LS0-6d -f

ноя 06 10:13:42 snmp-host systemd[1]: Starting Simple Network Management Protocol (SNMP) Daemon....
ноя 06 10:13:42 snmp-host snmpd[50286]: NET-SNMP version 5.9
ноя 06 10:13:42 snmp-host systemd[1]: Started Simple Network Management Protocol (SNMP) Daemon..

То что вы спрашивали не работает

snmpwalk: No securityName specified
[root@snmp-host user]# snmpwalk -v 2c -c public -O e localhost
Timeout: No Response from localhost