CODEWITHSUNDEEP
pysnmp
Michael Messingschlager
Michael Messingschlager

Reputation: 25

Get trap sender's IP with PySNMP

I build a small SNMP v3 trap receiver in python with pysnmp. In our network, the snmp enigine id and the users/passwords are equal on different machines. So i need the snmp trap senders ip address to identify the sending machine. How can i get the address, is there any function/method in pysnmp?

Upvotes: 0

Views: 1293

Answers (1)

Ilya Etingof
Ilya Etingof

Reputation: 5555

I think it is generally discouraged in SNMP to rely on peer address because of potential proxy/NAT/etc in-between. That probably explains why peer address information is not exposed in abstract SNMP APIs.

Do get hold of peer address in pysnmp you could use the observer feature:

# Callback function for receiving notifications
def cbFun(snmpEngine, stateReference, contextEngineId, contextName,
          varBinds, cbCtx):
    execContext = snmpEngine.observer.getExecutionContext(
        'rfc3412.receiveMessage:request'
    )

    print('Notification from %s:%s' % execContext['transportAddress'])

Here is the complete example.

Upvotes: 1

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