Re: Ending tables

Robert Story wrote:

>On Wed, 16 Feb 2005 18:02:42 -0800 John wrote:
>JH> I've implemented a new MIB and am having trouble walking
>JH> some of the tables. [...]
>JH> I've traced this with Ethereal and found that when a GET-NEXT
>JH> is received for the last row of the last column of a table and I can
>JH> then respond with the first row of the first column of the next table,
>JH> the client recognizes the end of the MIB. When it's my last table,
>JH> I see no response to the last request. The client resends it several
>JH> times then quits the walk with an error.
>
>What if you increase the timeout (-t 10, or 30)? If you run top, do you see
>snmpd chewing up the processor? Are you using a community string that is
>restricted to certain oids?
>
>JH> Does this sound familiar to anyone?
>
>It does sound familiar - if there is lots of data after your tables, and the
>community string is restrictive, the agent could spend a lot of time looking
>for the next accessible object. But we've made improvements in this area that
>are in 5.2, so unless you've got a complex access control system, I'd be
>surprised if this was the problem.
>
>
>
I'm enabling access in the snmpd.conf file with "rocommunity public" and
have
tried timeouts up to -t 60. Same problem. I tried adding a single
dummy scalar
to the end of our MIB and the problem goes away for the last table, but
moves
to the scalar. The client (snmpwalk) receives value of the dummy scalar
as the
last reply, then returns with a GETNEXT on that OID, but the agent returns
nothing. DEBUGMGSTL statements I've added in my own code show that
I'm returning NULL to the GETNEXT on the final OID in my MIB, but the
agent doesn't send anything to the client (per Ethereal). What should
I expect
it to return, something like "no such name"? Is there something I could be
neglecting that could cause this?


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