I have a strange behavior with the subagent. Trying to understand from past 2
months. Solving this issue is very important to me. Please help friends.
My subagent is receiving huge number of continuous snmpget and snmpset requests.
At a certain point I noticed the below observation from the snmp agent log.
Agent received snmpget request with var-bind of 20 items for my
subagent. After the agent sends the packet to subagent, the response is getting
delayed for some time. Tthe response is received by agent after 2 to 3
timeouts. This can be the reason as the subagent is receiving huge requests.
But for the 4th request the agent didn't receive any response before 5 timeouts
(max retries count is 5). For this request, in the tcpdump, I can see the
response as "noSuchInstance" for all 20 snmpget requests.
This is repeated 3 times.
Then for some snmpget requests, I can see "noSuchObject" in the get-response
for these requests in the tcpdump. From the agent log info, I can find the
below information for these snmpget requests.
handler:calling: main handler bulk_to_next
handler:calling: calling handler bulk_to_next for mode GET
handler:returned: handler bulk_to_next returned 0
handler:calling: calling handler null for mode GET
handler:returned: handler null returned 0
At the same time, for a snmpset request, I've seen "notWritable" error in the
response packet in the tcpdump. For this particular packet, I found the below
information in the agent log
agent_set: doing set mode = 0 (SET_RESERVE1)
KTK netsnmp_call_handlers: setting SNMP_ERR_NOTWRITABLE...
agent_set: did set mode = 0, status = 17
agent_set: doing set mode = 4 (SET_FREE)
KTK netsnmp_call_handlers: setting SNMP_ERR_NOTWRITABLE...
agent_set: did set mode = 4, status = 17
My debug statement KTK netsnmp_call_handlers: setting SNMP_ERR_NOTWRITABLE...
is placed in the net-snmp code as below
case MODE_SET_RESERVE1:
case MODE_SET_RESERVE2:
case MODE_SET_ACTION:
case MODE_SET_COMMIT:
case MODE_SET_FREE:
case MODE_SET_UNDO:
if (!(reginfo->modes & HANDLER_CAN_SET)) {
for (; requests; requests = requests->next) {
snmp_log(LOG_INFO, "KTK netsnmp_call_handlers: setting
SNMP_ERR_NOTWRITABLE...\n");
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_NOTWRITABLE);
}
return SNMP_ERR_NOERROR;
I am not able to understand this behavior. Anything wrong with my subagent??
Please help me. I am struggling to solve this issue from past 2 months. Please
help me friends.
Best Regards,
Karteek
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