Re: Query regarding ASYNC GET calls

Hi

On 5/11/2011 6:34 AM, Rahul Ravikanth Anneboina wrote:
>
> Hi …
>
> Need help from you’ll …..
>
> I have a piece of code (attached below) that sends out SNMP_MSG_GET 
> requests to an entire subnet.
>
> I am using snmp_async_send() to send out the requests and the 
> responses are read in the callback function asynch_response().
>
> The OID’s correspond to printer details and there are about 10 
> printers within that subnet.
>
> Every time the callback is triggered with 
> NETSNMP_CALLBACK_OP_TIMED_OUT and all the 255 IP’s time out. Ideally 
> it should get values for those 10 printers and time out the rest of 
> the IPs.
>
> Wireshark packets show that all 256 requests have been sent and 
> responses from the 10 printers have been received.
>
> If I break down the IP list to a bunch of 50 at a time, then I’m able 
> to get accurate results. But when I query all 256 at one go, I have 
> this problem.
>
> Please point me to where I am going wrong.
>
>
Assuming there are no problems in your piece of code then I am guessing 
this behavior might have something
to do with select() call and FD_SETSIZE (64)  limit  on Windows systems.

http://net-snmp.sourceforge.net/dev/agent/structnetsnmp__large__fd__set__s.html

You may want to try using    netsnmp_large_fd_set,  snmp_select_info2 
etc. and see if that makes any difference.

-- 
Xiang Li
http://www.champnms.com

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