how to use the DISMAN sub-system?

I was trying to use the monitor/proc facility that's built into snmpd,
but it turns out the processes I need to monitor are not providing
a unique enough name in hrSWRunName (which is used by 'proc')
[A useful name is available in hrSWRunPath instead, but 'proc' doesn't
use that field.]

So I thought I'd learn and see if the generic dismanExpression mechanism
could 'do my job'.

The first thing I think I need to do is create an entry in
the expExpressionTable.  The MIB says I need to do is:

"New expressions can be created using expExpressionRowStatus.
To create an expression first create the named entry in this table."

a) the MIB doesn't have a expExpressionRowStatus but it does have
   a expExpressionEntryStatus (so I assume this is a typo thats never
   been fixed).

b) so I try to write a 'create and wait' value to a new entry
   to cause it to create the row.  But that fails with:

Reason: notWritable (That object does not support modification)

I assume:
a) I need to use V3 to accomplish this.
b) the expExpressionOwner must match the -u username

I tried:

snmpset -v3  -u fulkow -a MD5 -A mypassword -l authPriv -x DES \
-X mypassword -n ""  localhost 1.3.6.1.2.1.90.1.2.1.1.9."fulkow"."test" i 5

[FYI: Yes, I have been able to prove that I can write to the sysContact
using v3.  So I think I'm past any basic problems, and am now
only having dismanExpression problems.]


Searching the internet, so far, I haven't been able to find any
examples of using this MIB.

Any help or pointers would be appreciated.

Fulko

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