snmp 陷阱未写入文件 [ubuntu]

发行商 ID：Ubuntu 描述：Ubuntu 16.04.2 LTS 版本：16.04 代号：xenial

安装了 snmpd snmptt snmp。

/etc/默认/snmpd

# This file controls the activity of snmpd

# Don't load any MIBs by default.
# You might comment this lines once you have the MIBs downloaded.
export MIBS=

# snmpd control (yes means start daemon).
SNMPDRUN=yes

# snmpd options (use syslog, close stdin/out/err).
SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -I -smux,mteTrigger,mteTriggerConf -p /run/snmpd.pid'

/etc/snmp/snmptt.ini

mode =daemon
net_snmp_perl_enable = 1
log_file = /var/log/snmptt/snmptt.log
log_enable = 1
unknown_trap_log_enable = 1
unknown_trap_log_file = /var/log/snmptt/snmpttunknown.log

/etc/snmp/snmptrapd.conf

authCommunity log,execute,net public
traphandle default snmptthandler

陷阱根本没有记录，尽管它们来自 tcpdump。

如果手动运行：

sudo service snmpd stop
sudo snmptrapd -f -L o

然后一切都被记录下来。也在日志中：

16:45:03 2017/04/18 SNMPTT v1.4 shutdown
16:45:03 2017/04/18 Total traps received=0,Total traps translated=0,Total traps ignored=0,Total unknown traps=0
16:45:04 2017/04/18 SNMPTT v1.4 started
16:45:04 2017/04/18 Loading /etc/snmp/snmptt.conf
16:45:04 2017/04/18 Finished loading 66 lines from /etc/snmp/snmptt.conf
16:45:04 2017/04/18 Loading
16:45:04 2017/04/18 Could not open configuration file:
16:45:04 2017/04/18 Changing to UID: snmptt (117)

我究竟做错了什么？无法打开配置文件：- 试图谷歌，并没有真正找到任何东西。