Listening on multiple network interfaces
****************************************

17. I need my receiving entity (CommandResponder or Notification
    Receiver) to listen for SNMP messages on multiple network
    interfaces. How do I do that with pysnmp?

1. Simply register multiple network transports with your SNMP
   engine. Each transport would be bound to an individual local
   transport endpoint (for instance, IP address & UDP port pair).

    # Security setup would follow
    ...
    # Setup first transport endpoint
    config.addSocketTransport(
        snmpEngine,
        udp.domainName + (1,),
        udp.UdpSocketTransport().openServerMode(('127.0.0.1', 162))
    )

    # Setup second transport endpoint
    config.addSocketTransport(
        snmpEngine,
        udp.domainName + (2,),
        udp.UdpSocketTransport().openServerMode(('192.168.1.1', 162))
    )
    # Receiver callback function implementation and Dispatcher invocation
    # would follow
    ...

   Notice extended transport domain specification (udp.domainName) in
   the code above. There we register each transport endpoint under distinct
   OID, however always within the canonical transport domain OID.
