I am trying to use Node Red to receive SNMP traps from other network devices, have Node Red format and send out packets to an MQTT broker. The issue I’m encountering is that my SNMP trap node never gets packets from either network ports, as if the Gateway’s firewall is blocking those packets. If the connection to that same SNMP enabled network device is initiated by Nod Red (i.e. a SNMP get node) Node red is able to get SNMP registers perfectly. Using the gateway’s debug tool (network trace) we can see that, whenever a trap message sends a packet to Node-Red’s trap receiver node (TCP port 162), the gateway network stack replies back with a “Destination Unreachable (Port unreachable)” network message.
I have tried everything I could think of to no avail. And I should mention that this same flows and settings work very well on a PC.
I could not find a way to disable the firewall and verify if there is another problem, so that would be my first question.
Thank you