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

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

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

I looked in the docs, Googled, etc. and am pretty stumped.  Any help or
pointers are appreciated.

Thanks
Ted


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