RE: How to send an SNMP broadcast?

> From: Reinhold Kainhofer [mailto:[email protected]]

> >   An alternative you might try is to derive your individual IP
network
> > broadcast address and see if that works.

> Thanks for the hint, but that doesn't work either

  That's unfortunately also common.

  I guess that the net-snmp package isn't setting the "SO_BROADCAST"
option in the underlying setsockopt() call?

  I just tried universal broadcast gets on a Linux and a Windows
machine, but they also failed in sendto, e.g.:

C:\>snmpget -v 2c -c public 192.168.1.208 system.sysName.0
SNMPv2-MIB::sysName.0 = STRING: CEP100_CEP1.6

C:\>snmpget -v 2c -c public 255.255.255.255 system.sysName.0
snmpget: Failure in sendto (Sub-id not found: (top) -> system) (No such
file or directory)

  However, when I repeated the commands using the network broadcast
address, snmpget on the Windows machine returned only the first:

C:\>snmpget -v 2c -c public 192.168.63.255 system.sysName.0
SNMPv2-MIB::sysName.0 = STRING: Smoketest Terminals

  The network address still failed on the Linux machine, which seems to
match what you're seeing.

  (I know for a fact there are many more SNMP agents on this network
matching that community string so I'm not sure that using SNMP for
device discovery is your best option.)

  Ron



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