Hi group,
Server uname: Linux 2.6.32-642.13.1.el6.x86_64 #1 SMP Wed Jan 11 20:56:24
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Agent uname: Linux 2.6.32-642.13.1.el6.x86_64 #1 SMP Wed Jan 11 20:56:24
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
I am generating 5 log messages at 2 second intervals to trigger rule 1002.
16:40:43 [quintinb@ho-pri-vm-quintindev ~]$ for x in {11..15}; do logger
test error$x; date; sleep 2; done
Thu Feb 9 16:40:48 SAST 2017
Thu Feb 9 16:40:50 SAST 2017
Thu Feb 9 16:40:52 SAST 2017
Thu Feb 9 16:40:54 SAST 2017
Thu Feb 9 16:40:56 SAST 2017
A tcpdump on the server indicates all 5 are received:
16:40:49.197974 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length 121
16:40:51.200118 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length 121
16:40:53.202224 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length 121
16:40:55.204480 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length 121
16:40:57.206407 IP 10.10.10.100.41074 > 10.10.12.171.1514: UDP, length 121
Though alerts.log only shows 3 of the 5.
** Alert 1486651295.2432248: mail - syslog,errors,
2017 Feb 09 16:41:35 (quintindev) 10.10.10.100->/var/log/messages
Rule: 1002 (level 2) -> 'Unknown problem somewhere in the system.'
Feb 9 16:40:48 ho-pri-vm-quintindev quintinb: test error11
** Alert 1486651298.2432494: mail - syslog,errors,
2017 Feb 09 16:41:38 (quintindev) 10.10.10.100->/var/log/messages
Rule: 1002 (level 2) -> 'Unknown problem somewhere in the system.'
Feb 9 16:40:52 ho-pri-vm-quintindev quintinb: test error13
** Alert 1486651305.2432740: mail - syslog,errors,
2017 Feb 09 16:41:45 (quintindev) 10.10.10.100->/var/log/messages
Rule: 1002 (level 2) -> 'Unknown problem somewhere in the system.'
Feb 9 16:40:56 ho-pri-vm-quintindev quintinb: test error15
Sometimes it alerts on all 5. Though upon inspection it seems OSSEC misses
50%+ of my messages, even though I see the packets delivered to the server.
Is there an explanation for this? Any way I can get more verbose logging
on this to investigate deeper?
Quintin
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