SNMPV3
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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. -
I found a hint about this problem in the local log file of the affected node. There is a system protection function which blocks the SNMP get requests from the NetXMS server because of requests with null community string (CVE-1999-0517). In the communication settings of this NetXMS node there are valid SNMPv3 credentials of course.
So maybe this problem has the same reason as the 'SNMP auth. failures'. -
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Yes, you can compile from the hourly snapshot of GIT repo and test with that.
The fixes were mostly to snmp in relation to agent proxying and to snmp discovery, but maybe you will see some difference.If none of these help (so your issue is still present after testing these newest changes), we will know yours is a totally separate issue.
The develop branch is pretty stable at the moment (I run 2 medium sized installs ~150 nodes each on it atm.), but of course be advised that it is not released code and consider backups of db/server before deploying it
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Thanks Tomas.
I tried to compile hourly snapshot from git repo. But I get this error:
make[3]: Entering directory `/usr/src/netxms-2.0-dev-2015-12-14/src/libstrophe' CC libstrophe_la-auth.lo In file included from ../../include/nms_common.h:78:0, from auth.c:19: ../../include/netxms-version.h:27:30: fatal error: netxms-build-tag.h: No such file or directory #include <netxms-build-tag.h> ^ compilation terminated. make[3]: *** [libstrophe_la-auth.lo] Error 1 make[3]: Leaving directory `/usr/src/netxms-2.0-dev-2015-12-14/src/libstrophe' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/usr/src/netxms-2.0-dev-2015-12-14/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/usr/src/netxms-2.0-dev-2015-12-14' make: *** [all] Error 2autoconf, flex, bison, libtool are installed.
What can I do? -
Script, which generate this header require git repo, not a snapshot. It's a bug.
However, if you clone repo instead of using snapshot – it will work.
Repository url for clone is https://git.netxms.org/public/netxms.gitP.S. don't forget to switch branch to "develop" (git checkout develop)
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I've fixed that, now snapshots should work as well
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Is the also a solution for this topic
https://www.netxms.org/forum/configuration/snmp-credentials/
im still hesitant to upgrade to 2.0 because i really dont want to have to reset over 200 switches due to the wrong community string being sent out repeatedly
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