Activar SNMP v3 en Fedora

29 November 2025
#snmp, #monitorization, #prtg, #fedora

Install snmp and agent:

# sudo dnf install net-snmp net-snmp-utils

Configure snmp v3:

# sudo nano /etc/snmp/snmpd.conf

# SNMPv3

rouser snmp_user authPriv


# Restrict access

ip_agent_Address udp:161

Create snmp v3 user:

# sudo net-snmp-create-v3-user -ro -A "PasswordAuth" -X "PasswordPriv" -a SHA -x AES snmp_user

Enable and start service:

# sudo systemctl enable snmpd
# sudo systemctl restart snmpd
# sudo systemctl status snmpd

Open 161 UPD in firewall:

# sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="ip_agent_address" port port="161" protocol="udp" accept'
# sudo firewall-cmd --reload

Check snmp working:

# snmpwalk -v3 -u snmp_user -l authPriv -a SHA -A "PasswordAuth" -x AES -X "PasswordPriv" localhost sysDescr

If we have problems witth the password, do the checkings:

Check if the user exist:

sudo cat /var/lib/net-snmp/snmpd.conf | grep -i snmp_user

If user not exist, create the user:

# sudo net-snmp-create-v3-user -ro -A "PasswordAuth" -X "PasswordPriv" -a SHA -x AES snmp_user

If password dont match, delete user and recreate:

sudo systemctl stop snmpd
sudo rm -f /var/lib/net-snmp/snmpd.conf

sudo systemctl start snmpd

# sudo net-snmp-create-v3-user -ro -A "PasswordAuth" -X "PasswordPriv" -a SHA -x AES snmp_user

sudo systemctl restart snmpd

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