Re: how to report stats for a fake network interface in Linux?

On Fri, 24 Sep 2010 13:32:13 -0500 Ted Zlatanov <[email protected]> wrote: 

TZ> I have some rapidly changing stats I want to report via SNMP.  It would
TZ> be terrific if I could do that in the IF-MIB interface table, but it's
TZ> pretty hard to plug in my Perl subagent in just the right places.

TZ> I investigated creating a fake network device module but that seems too
TZ> invasive for reporting stats.  I can't use a 'dummy' network device
TZ> because Linux doesn't allow me to set the net_device_stats data directly
TZ> from userspace.  So is there a way to lie to SNMP about the number of
TZ> network interfaces and provide an extra one (with some stats) to it?

After looking further into it, agent/mibgroup/mibII/interfaces.c and
agent/mibgroup/if-mib/data_access/interface*.c seem like the happening
place for all this.  I'd like to override
agent/mibgroup/if-mib/data_access/interface_linux.c:_parse_stats() for a
custom 'dummy' device we only have on Linux machines.  The stats will
come from a secondary interface, not /proc as usual.  Does that seem
like a good plan or should I hook into a higher level of the if-mib
parsing hierarchy?

Thanks again
Ted


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