Transport tweaks
****************


Listen on multiple network interfaces
=====================================

Listen and respond to SNMP GET/SET/GETNEXT/GETBULK queries with the
following options:

* SNMPv2c

* with SNMP community "public"

* allow access to SNMPv2-MIB objects (1.3.6.1.2.1)

* over IPv4/UDP, listening at 127.0.0.1:161 and 127.0.0.2:161
  interfaces

* using Twisted framework for network transport

Either of the following Net-SNMP commands will walk this Agent:

   $ snmpwalk -v2c -c public 127.0.0.1 .1.3.6
   $ snmpwalk -v2c -c public 127.0.0.2 .1.3.6

   from twisted.internet import reactor
   from pysnmp.entity import engine, config
   from pysnmp.entity.rfc3413 import cmdrsp, context
   from pysnmp.carrier.twisted.dgram import udp

   # Create SNMP engine with autogenernated engineID and pre-bound
   # to socket transport dispatcher
   snmpEngine = engine.SnmpEngine()

   # Transport setup

   # UDP over IPv4 at 127.0.0.1:161
   config.addTransport(
       snmpEngine,
       udp.domainName + (1,),
       udp.UdpTwistedTransport().openServerMode(('127.0.0.1', 161))
   )

   # UDP over IPv4 at 127.0.0.2:161
   config.addTransport(
       snmpEngine,
       udp.domainName + (2,),
       udp.UdpTwistedTransport().openServerMode(('127.0.0.2', 161))
   )

   # SNMPv2c setup

   # SecurityName <-> CommunityName mapping.
   config.addV1System(snmpEngine, 'my-area', 'public')

   # Allow full MIB access for this user / securityModels at VACM
   config.addVacmUser(snmpEngine, 2, 'my-area', 'noAuthNoPriv', (1, 3, 6, 1, 2, 1), (1, 3, 6, 1, 2, 1))

   # Get default SNMP context this SNMP engine serves
   snmpContext = context.SnmpContext(snmpEngine)

   # Register SNMP Applications at the SNMP engine for particular SNMP context
   cmdrsp.GetCommandResponder(snmpEngine, snmpContext)
   cmdrsp.SetCommandResponder(snmpEngine, snmpContext)
   cmdrsp.NextCommandResponder(snmpEngine, snmpContext)
   cmdrsp.BulkCommandResponder(snmpEngine, snmpContext)

   # Run Twisted main loop
   reactor.run()

"Download" script.

See also: library reference.
