Cannot Process SNMP Traps

Thu, 16 Dec 2004 17:32:43 -0800 

Hi,

I am attempting to receive traps from various devices on my network (Copper Mountain DSLAMs, Cisco routers, etc.) so that I can then funnel the traps into Nagios for network monitoring. However, nothing I have tried for the last three or more months has allowed me to receive/handle any traps sent by any devices. Below are some relevant files and configuration.

10782 ? S 0:00 /usr/sbin/snmpd -Lsd -Lf /dev/null -p /var/run/snmpd.pid
10784 ? Ss 0:00 /usr/sbin/snmptrapd -Lsd -p /var/run/snmptrapd.pid

snmptrapd.conf:
traphandle default /usr/local/bin/traphandle.sh default

traphandle.sh:
#!/bin/bash

LOGFILE="/tmp/snmptrapd.log"

case ${1} in
  default)
    echo -e "Found default trap:" >> ${LOGFILE}
    echo -e "${*}\n" >> ${LOGFILE}
    ;;
  *)
    echo -e "Found unhandled trap:" >> ${LOGFILE}
    echo -e "${*}\n" >> ${LOGFILE}
    ;;
esac

exit 0

snmp.conf
mibs ALL

I have the Copper Mountain MIB located in /usr/share/snmp/mibs, where all of the other default MIBs are located. When run in debug mode, the snmptrapd output shows the Copper Mountain MIB is processed. When I bring up and drop an interfaces on a Copper Mountain DSLAM, tcpdump on the receiving host running snmptrapd shows:

09:36:35.926828 IP 172.20.7.2.1966 > ldhl-sentry.natcotech.com.snmp-trap: C=Natco Trap(36) E:1996 172.20.7.2 enterpriseSpecific s=12 132246500 .iso.org=[|snmp]
09:37:14.772609 IP 172.20.7.2.1967 > ldhl-sentry.natcotech.com.snmp-trap: C=Natco Trap(36) E:1996 172.20.7.2 enterpriseSpecific s=12 132246890 .iso.org=[|snmp]

So I know the trap packet is being received. But the file /tmp/snmptrapd.log referenced in the traphandle.sh script never has anything in it.

Can someone please help me figure out why I have never been able to receive or process SNMP traps using net-snmp--before I go stark raving mad? If someone is able to work with me via phone or IM in an interactive way, that would be greatly appreciated.

Regards,
Russ


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