Hi
This is regarding snmptrapd.
I have noticed that when there are considerable amount of traps (1000+/min) arrive at the interface some of them are dropped, or not logged into /var/log/trapd.log
Before making this post I have search the web quite a bit for this issue but could not find any relevant info.
To simulate it I have simple script on server A sending traps to server B every second.
I can see these traps on the B server tcpdump and they all arrive OK.
But when I search for them in /var/log/snmp/trap.log I see some gaps.
This is quite important for me to make sure that no traps are lost.
When I run the same test in the lab for few hours with no load, I see ZERO packets lost, everything matches perfectly, the number of sent traps, the number of received traps in tcpdump and number of traps in /var/log/snmp/trapd.log
but when under load in the prod environment, which runs RHEL6.8 with around 1500 traps per min, I see some gaps.
the same happens in another prod environment running CentsOS6.5
I would really appreciate your help here.
Here is the:
----------------------------------------------------------------------
# ps -ef | grep snmptrapd
root 21077 1 0 Sep01 ? 00:02:19 /usr/sbin/snmptrapd -Lf /var/log/snmp/trapd.log -p /var/run/snmptrapd.pid
----------------------------------------------------------------------
and
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# cat /etc/snmp/snmptrapd.conf
# Example configuration file for snmptrapd
#
# No traps are handled by default, you must edit this file!
#
# authCommunity log,execute,net public
# traphandle SNMPv2-MIB::coldStart /usr/bin/bin/my_great_script cold
disableAuthorization yes
ignoreAuthFailure yes
----------------------------------------------------------------------
and
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# cat /etc/sysconfig/snmptrapd
# snmptrapd command line options
# OPTIONS="-Lsd -p /var/run/snmptrapd.pid"
OPTIONS="-Lf /var/log/snmp/trapd.log -p /var/run/snmptrapd.pid"
----------------------------------------------------------------------
Any advice will be much appreciated.
Thank you
Mike
snmptrapd is dropping packets when under load
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