Make sure the following packages are installed:

net-snmp-devel
net-snmp
net-snmp-libs
net-snmp-perl
net-snmp-utils
snmptt
nsca

Change the configuration of snmptrapd in “/etc/sysconfig/snmptrapd”:

OPTIONS="-On -Lsd -p /var/run/snmptrapd.pid"

These should all be available on the default repositiries and EPEL.

The file snmptrapd.conf should look like this:

# 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
#
authCommunity log,execute,net public
traphandle default /usr/bin/snmptt

To send a snmptrap to Nagios, you need to make sure the configuration of snmptt submits the command to Nagios:

To convert mibs to snmptt.conf fiel we need to do a snmpttconvertmib:

snmpttconvertmib --in=FOUNDRY-SN-NOTIFICATION-MIB.mib --out=snmptt.conf.foundry --net_snmp_perl --exec="/etc/nagios/snmptrap/submit_check_result \$r snmptrap OK \"\$* \$x - \$X: \$D\""

The script that submits the info to Nagios using NSCA:

#!/bin/sh

 # Arguments:
 # $1 = host_name (Short name of host that the service is
 # associated with)
 # $2 = svc_description (Description of the service)
 # $3 = state_string (A string representing the status of
 # the given service - "OK", "WARNING", "CRITICAL"
 # or "UNKNOWN")
 # $4 = plugin_output (A text string that should be used
 # as the plugin output for the service checks)
 #

 # Convert the state string to the corresponding return code
 return_code=-1

 case "$3" in
 OK)
 return_code=0
 ;;
 WARNING)
 return_code=1
 ;;
 CRITICAL)
 if [[ $4 =~ '.*up down.*UP_.*' ]]
 then
 echo "UPLINK!"
 return_code=2
 elif [[ $4 =~ '.*up down.*MON_.*' ]]
 then
 echo "Monitored Klantpoort"
 return_code=2
 elif [[ $4 =~ '.*up down.*' ]]
 then
 echo "Klantpoort"
 return_code=1
 else
 echo "andere trap"
 return_code=2
 fi
 ;;
 UNKNOWN)
 return_code=-1
 ;;
 esac

 # pipe the service check info into the send_nsca program, which
 # in turn transmits the data to the nsca daemon on the central
 # monitoring server

/usr/bin/printf "%s\t%s\t%s\t%s\n" "$1" "$2" "$return_code" "$4" | /usr/sbin/send_nsca 127.0.0.1 -c /etc/nagios/send_nsca.cfg

To have a check for this passive check, so people learn not to reschedule:

#! /usr/bin/perl -w


use strict;
use Getopt::Long;
use vars qw($opt_V $opt_h $PROGNAME);
use lib "/usr/lib/nagios/plugins/"  ;
use utils qw(%ERRORS &print_revision &support &usage);

$PROGNAME = "check_snmptrap";

sub print_help ();
sub print_usage ();

$ENV{'PATH'}='';
$ENV{'BASH_ENV'}='';
$ENV{'ENV'}='';

Getopt::Long::Configure('bundling');
GetOptions
        ("V"   => \$opt_V, "version"    => \$opt_V,
         "h"   => \$opt_h, "help"       => \$opt_h,);

if ($opt_V) {
        print_revision($PROGNAME,': 0.1');
        exit $ERRORS{'OK'};
}


if ($opt_h) {print_help(); exit $ERRORS{'OK'};}


print "CRITICAL - Je doet het fout (PEBKAC)\n"; exit $ERRORS{'CRITICAL'};


sub print_usage () {
        print "Usage: $PROGNAME \n";
}

sub print_help () {
        print_revision($PROGNAME,': 0.1');
        print "Copyright (c) 2010 Rob Hassing

This plugin reports the usage of snmptraps

";
        print_usage();
        print "
-h,
   help
";
}