RE: Query regarding ASYNC GET calls

Thank you Xiang, that worked!

 

From: Xiang Li [mailto:[email protected]] 
Sent: Monday, May 16, 2011 1:40 AM
To: Rahul Ravikanth Anneboina
Cc: [email protected]
Subject: 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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