# yum install -y net-snmp*

# cp /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.bak

> /etc/snmp/snmpd.conf ; cat > /etc/snmp/snmpd.conf< (configure /etc/snmp/snmp.local.conf)
dontLogTCPWrappersConnects yes
EOF

# systemctl restart snmpd

# iptables -A INPUT -p udp -m state --state -m udp --dport 161 -j ACCEPT
# service iptables save

# firewall-cmd --zone=public --add-port=161/udp --permanent
# firewall-cmd --reload