Alerting of Host

[Jack A. Kanimea]

Hi, 

Might sound like a funny question but am having difficulties with the alert for nagios. At the moment we also have another alerting program that we would like to migrate to nagios. THe alerting in other program can be set in term of downtime. For example I set if there no ping request for 15min continously please alert me. This take care of the problem of flapping as well as false alarms alert on host actually going down. Am trying to configure nagios to do the same requirment but I think I may done something wrong. The alert am getting from nagios is either to late or if I get a down alert I can still ping the host and a reply is coming. 
All I want to know if nagios can alert us base on if host is down for XXX minutes then alert. The closet I found on doc to do this was on flapping of hosts. But I think my configuration may be wrong I must be doing something wrong

Any advise or suggestion would be greatly appreciated.

My configuration are as follow:- Please correct if I am wrong

In hosts.cfg a typical hosts configuration appears as
__________________________________
define host{
host_name r_itc_pc
alias Suva_Test_PC
address 10.1.87.60
parents s_itc_gigswitch
check_command check-host-alive
max_check_attempts 5
check_interval 1
check_period 24x7
active_checks_enabled 1
passive_checks_enabled 0
check_freshness 1
freshness_threshold 10
process_perf_data 0
retain_status_information 0
retain_nonstatus_information 0
contact_groups network-admin
notification_interval 0
notification_period 24x7
notification_options d,r
________________________________________

In my nagios.cfg I read some doc on flapping and so I enable this 

___________________________________________________
# FLAP DETECTION OPTION
# This option determines whether or not Nagios will try
# and detect hosts and services that are "flapping".
# Flapping occurs when a host or service changes between
# states too frequently.  When Nagios detects that a
# host or service is flapping, it will temporarily supress
# notifications for that host/service until it stops
# flapping.  Flap detection is very experimental, so read
# the HTML documentation before enabling this feature!
# Values: 1 = enable flap detection
#         0 = disable flap detection (default)

enable_flap_detection=1

# FLAP DETECTION THRESHOLDS FOR HOSTS AND SERVICES
# Read the HTML documentation on flap detection for
# an explanation of what this option does.  This option
# has no effect if flap detection is disabled.

low_service_flap_threshold=5.0
high_service_flap_threshold=20.0
low_host_flap_threshold=25.0
high_host_flap_threshold=25.0
_______________________________________________________

I also read something on freshness so I enable option in nagiios as follows 

_______________________________________-
# HOST FRESHNESS CHECK OPTION
# This option determines whether or not Nagios will periodically
# check the "freshness" of host results.  Enabling this option
# is useful for ensuring passive checks are received in a timely
# manner.
# Values: 1 = enabled freshness checking, 0 = disable freshness checking

check_host_freshness=1



# HOST FRESHNESS CHECK INTERVAL
# This setting determines how often (in seconds) Nagios will
# check the "freshness" of host check results.  If you have
# disabled host freshness checking, this option has no effect.

host_freshness_check_interval=60

------------------------___________________

Any advise or suggestion would be greatly appreciated.

thanks in advance,
jk




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