SNMPV3
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Here you go.. Its seems worse with 2.0-RC2 I had to reboot my switch several times because it was continually trying several times per second and by default the ruggedcoms will quit responding after so many failed attempts. I also attached the switch debug screen. I have also tried 1.2.17 linux version running on ubuntu thinking maybe it was a windows thing
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Hi,
it could be a bug in NetXMS SNMP library. Is it possibe to get access over SNMP to your switch so we can test and fix it? Please send me private message if that's possible.
Best regards,
Victor -
Hi,
I've fixed bug in SNMP library, thanks for the access to the switch! Fix will be included in 2.0 release. If you built NetXMS from sources I can provide you a patch.
Best regards,
Victor -
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And by the way thank you for the quick fix ....you mentioned the fix will be released in 2.0 ... ive been wanting to move to 2.0 rc but wasnt sure how stable things are and didnt want to have to migrate everything from 1.2 .. how far along would you guess 2.0 is from being stable release
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Hi,
patch for src/snmp/libnxsnmp/transport.cpp attached.
We plan to make 2.0 release before December 10th.
Best regards,
Victor
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We have a new problem with SNMP, maybe something similar as the points above.
We use NetXMS V2.0-RC2 compiled with patched transport.cpp (I attached the patched one).
After Software Update on some ZyXEL Access-Points these devices stop responding to SNMPv3 (SHA1, AES) after a while. I also checked by snmpwalk on command line. I have to reboot the affected Access-Points, but after a short while the same. When I disable all SNMP on these nodes in NetXMS, SNMP on these APs are stable (checked by snmpwalk on command line).
Which information do you need for further troubleshooting?thanks
Dani
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Hi,
how fast device stops responding to SNMP? If you disable SNMP in NetXMS and run snmpwalk or snmpget from command line in a loop, will it have the same effect?
Best regards,
Victor -
Hi Victor
First I thought it's only by configuration polls. But some APs 'crash' quite fast, after a few minutes. But I also saw APs where it lasts longer. I can start about 50 snmpwalks from command line in short time without any problems (about 20 OIDs each). Only disabling configuration polls on these nodes is not enough. I have to disable SNMP completely for these nodes. If SNMP is completely disabled the SNMP service on these APs are stable permanent.
thanks
Dani -
Try to disable routing table and topology polls.
Best regards,
Victor -
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Dani@M3T
I think you are still experiencing this issue https://www.netxms.org/forum/configuration/snmp-credentials/ I dont think the patch fixed this particular error where even though snmpv3 credentials now work the server is still sending out some requests with public as default .. I am seeing the same thing on my test switch snmpv3 and v2 works great now but I am still seeing snmp auth failures about 100 a day but on our switches there is a threshold that can be set I think the default is 10 failures in a minute before its stops responding which i increased untill this gets fixed ....
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So it seems that topology or routing table polls cause SNMP agent hang in access points. Most likely it's a bug in SNMP agent. We can try to narrow it further by enabling one of the polls. Topology poll usually do more requests than routing table poll.
Best regards,
Victor -
Hi Victor
I made these tests:
- reenabled routing table poll, waiting 20h -> SNMP agent on node still replying
- reenable topology polling, waiting about 20h -> SNMP agent dead
But what can we do? Is it a problem in NetXMS or in SNMP implementation on node? If it is the second I need good arguments for there support
edit:
A later test with disabled topology poll -> SNMP agent dead again
So the problem is not fixed to topology poll
thanks
Dani -
I will try it with a support case at the vendor of the APs.
Another problem on other SNMP enabled nodes:
Suddenly no SNMP data is possible to poll. But the SNMP agent on these nodes are fine (test by snmpwalk on command line).
When I restart netxmsd everything is fine again. It's also with SNMPv3.
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