RE: couldn't open udp:162 -- errno 98 ("Address already in use")

Hi,

From what I see : It seems that the SNMP trap daemon is working and listening on port  162, what is OK.

How is this daemon configured :
snmptrapd.conf ? => per default the Traps are not handled

How is your cisco router configured: / does it send Traps ?
            snmp-server host Your-VM-IP Your-trap-Community

       snmp-server enable traps The-Traps-You-Want-To-See

Are the traps reaching the VM:
            Sniffing with Wireshark

Hope this helps

Best regards
JMJ





De : riva riv [mailto:[email protected]]
Envoyé : mercredi, 17. mai 2017 10:33
À : [email protected]
Objet : couldn't open udp:162 -- errno 98 ("Address already in use")

Hi Experts,

I am trying to receive a trap generated by a cisco router on my VM- Ubuntu 14.04. I can do a snmwalk so I guess snmp is working fine but I am not able to receive the traps generated by router on my VM.

a@ubuntu:~$ sudo /etc/init.d/snmpd restart
 * Restarting network management services:
a@ubuntu:~$ sudo /etc/init.d/snmpd status
 * snmpd is running
 * snmptrapd is running

Here is what I have inside files-

/etc/default/snmpd-
export MIBS=
SNMPDRUN=yes
SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid -c /etc/snmp/snmpd.conf'
TRAPDRUN=yes
# snmptrapd options (use syslog).
TRAPDOPTS='-n -On -t -Lsd -p /var/run/snmptrapd.pid'

/etc/snmp/-

snmpd.conf-
rocommunity public

snmptrapd.conf-
disableAuthorization yes

snmp.conf-
mibs:

The command I am running for viewing the traps on VM-

a@ubuntu:/etc/snmp$ sudo snmptrapd -f -Lo -c snmptrapd.conf
couldn't open udp:162 -- errno 98 ("Address already in use")

I am confused since the port is being used by snmptrap itself-

a@ubuntu:~$ cat /etc/services|grep 162
snmp-trap 162/tcp snmptrap # Traps for SNMP
snmp-trap 162/udp snmptrap
a@ubuntu:~$ sudo netstat -lnp| grep 162
udp        0      0 0.0.0.0:162<http://0.0.0.0:162/>             0.0.0.0:*                           6216/snmptrapd
a@ubuntu:~$ ps -ef | grep snmptrapd
root       6216   2076  0 10:43 ?        00:00:00 /usr/sbin/snmptrapd -Lsd -p /var/run/snmptrapd.pid
a    6493   2667  0 11:47 pts/8    00:00:00 grep --color=auto snmptrapd

Is there any way of solving this issue? I have googled a lot and stuck on this for days, any help will be very much appreciated.
Thanks a lot in advance!!

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