Transport tweaks¶
Serving multiple network interfaces¶
Receive SNMP TRAP/INFORM messages with the following options:
- SNMPv1/SNMPv2c
- with SNMP community “public”
- over IPv4/UDP, listening at 127.0.0.1:162 over IPv4/UDP, listening at 127.0.0.1:2162
- print received data on stdout
Either of the following Net-SNMP commands will send notifications to this receiver:
$ snmptrap -v2c -c public 127.0.0.1:162 123 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.5.0 s test
$ snmpinform -v2c -c public 127.0.0.1:2162 123 1.3.6.1.6.3.1.1.5.1
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity.rfc3413 import ntfrcv
# Create SNMP engine with autogenernated engineID and pre-bound
# to socket transport dispatcher
snmpEngine = engine.SnmpEngine()
# Transport setup
# UDP over IPv4, first listening interface/port
config.addTransport(
snmpEngine,
udp.DOMAIN_NAME + (1,),
udp.UdpTransport().openServerMode(('127.0.0.1', 162))
)
# UDP over IPv4, second listening interface/port
config.addTransport(
snmpEngine,
udp.DOMAIN_NAME + (2,),
udp.UdpTransport().openServerMode(('127.0.0.1', 2162))
)
# SNMPv1/2c setup
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public')
# Callback function for receiving notifications
# noinspection PyUnusedLocal,PyUnusedLocal,PyUnusedLocal
def cbFun(snmpEngine, stateReference, contextEngineId, contextName,
varBinds, cbCtx):
print('Notification from ContextEngineId "%s", ContextName "%s"' % (contextEngineId.prettyPrint(),
contextName.prettyPrint()))
for name, val in varBinds:
print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))
# Register SNMP Application at the SNMP engine
ntfrcv.NotificationReceiver(snmpEngine, cbFun)
snmpEngine.transportDispatcher.jobStarted(1) # this job would never finish
# Run I/O dispatcher which would receive queries and send confirmations
try:
snmpEngine.transportDispatcher.runDispatcher()
finally:
snmpEngine.transportDispatcher.closeDispatcher()
Download script.
Using multiple network transports¶
Receive SNMP TRAP/INFORM messages with the following options:
- SNMPv1/SNMPv2c
- with SNMP community “public”
- over IPv4/UDP, listening at 127.0.0.1:162 over IPv6/UDP, listening at [::1]:162
- print received data on stdout
Either of the following Net-SNMP commands will send notifications to this receiver:
$ snmptrap -v1 -c public 127.0.0.1 1.3.6.1.4.1.20408.4.1.1.2 127.0.0.1 1 1 123 1.3.6.1.2.1.1.1.0 s test
$ snmptrap -v2c -c public udp6:[::1]:162 123 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.5.0 s test
$ snmpinform -v2c -c public 127.0.0.1 123 1.3.6.1.6.3.1.1.5.1
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp, udp6
from pysnmp.entity.rfc3413 import ntfrcv
# Create SNMP engine with autogenernated engineID and pre-bound
# to socket transport dispatcher
snmpEngine = engine.SnmpEngine()
# Transport setup
# UDP over IPv4
config.addTransport(
snmpEngine,
udp.DOMAIN_NAME,
udp.UdpTransport().openServerMode(('127.0.0.1', 162))
)
# UDP over IPv6
config.addTransport(
snmpEngine,
udp6.DOMAIN_NAME,
udp6.Udp6Transport().openServerMode(('::1', 162))
)
# SNMPv1/2c setup
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public')
# Callback function for receiving notifications
# noinspection PyUnusedLocal,PyUnusedLocal,PyUnusedLocal
def cbFun(snmpEngine, stateReference, contextEngineId, contextName,
varBinds, cbCtx):
print('Notification from ContextEngineId "%s", ContextName "%s"' % (contextEngineId.prettyPrint(),
contextName.prettyPrint()))
for name, val in varBinds:
print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))
# Register SNMP Application at the SNMP engine
ntfrcv.NotificationReceiver(snmpEngine, cbFun)
snmpEngine.transportDispatcher.jobStarted(1) # this job would never finish
# Run I/O dispatcher which would receive queries and send confirmations
try:
snmpEngine.transportDispatcher.runDispatcher()
finally:
snmpEngine.transportDispatcher.closeDispatcher()
Download script.
Receive notifications noting peer address¶
Receive SNMP TRAP/INFORM messages with the following options:
- SNMPv1/SNMPv2c
- with SNMP community “public”
- over IPv4/UDP, listening at 127.0.0.1:162
- use observer facility to pull lower-level request details from SNMP engine
- print received data on stdout
Either of the following Net-SNMP commands will send notifications to this receiver:
$ snmptrap -v2c -c public 127.0.0.1:162 123 1.3.6.1.6.3.1.1.5.1 1.3.6.1.2.1.1.5.0 s test
from pysnmp.entity import engine, config
from pysnmp.carrier.asyncore.dgram import udp
from pysnmp.entity.rfc3413 import ntfrcv
# Create SNMP engine with autogenernated engineID and pre-bound
# to socket transport dispatcher
snmpEngine = engine.SnmpEngine()
# Transport setup
# UDP over IPv4, first listening interface/port
config.addTransport(
snmpEngine,
udp.DOMAIN_NAME + (1,),
udp.UdpTransport().openServerMode(('127.0.0.1', 162))
)
# SNMPv1/2c setup
# SecurityName <-> CommunityName mapping
config.addV1System(snmpEngine, 'my-area', 'public')
# Callback function for receiving notifications
# noinspection PyUnusedLocal,PyUnusedLocal
def cbFun(snmpEngine, stateReference, contextEngineId, contextName,
varBinds, cbCtx):
# Get an execution context...
execContext = snmpEngine.observer.getExecutionContext(
'rfc3412.receiveMessage:request'
)
# ... and use inner SNMP engine data to figure out peer address
print('Notification from %s, ContextEngineId "%s", '
'ContextName "%s"' % ('@'.join([str(x) for x in execContext['transportAddress']]),
contextEngineId.prettyPrint(),
contextName.prettyPrint()))
for name, val in varBinds:
print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))
# Register SNMP Application at the SNMP engine
ntfrcv.NotificationReceiver(snmpEngine, cbFun)
snmpEngine.transportDispatcher.jobStarted(1) # this job would never finish
# Run I/O dispatcher which would receive queries and send confirmations
try:
snmpEngine.transportDispatcher.runDispatcher()
finally:
snmpEngine.transportDispatcher.closeDispatcher()
Download script.
See also: library reference.