Enable Masquerade to allow port forwarding sudo firewall-cmd --permanent --add-masquerade Forward SNMP Trap UDP port 162 to 10162 sudo firewall-cmd --permanent --add-port=162/udp sudo firewall-cmd --permanent --add-port=10162/udp sudo firewall-cmd --permanent --add-forward-port=port=162:proto=udp:toport=10162 sudo systemctl reload firewalld