pass command problem (cache problem)

[johanfirdi <joh...@jo...>]

dear guys,

here my sample pass command in snmpd.conf

pass  .1.3.6.1.4.1.2021.123  /root/test

and here content script /root/test
#!/bin/sh
#echo .1.3.6.1.4.1.2021.123
echo $2
echo "integer"
ipfw show 64000 | awk '{ print $2 }'

The problem is
 I do snmpget to above oid, the result unchanged when I do snmpget again 
10 seconds later, or 20 seconds later, still remain with old value.
when I type ipfw show 64000 | awk '{ print $2 }' at bash prompt, the 
value is already changed.
But after 30 seconds later, the value will changed.
Any cache value stored in snmpd ?.
I read snmpd.conf, about stash_cache (that will refill value in cache 
after 30 seconds) ?
and than I touch the code of snmp, in file agent/helpers/stash_cache.c
Change the line
 cinfo->cache_length = 30 become 10
and than doing reconfigure, make and make install.
no changing happened.
any suggest ?.

Thanks.

Johan