<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7653.38"> <TITLE>Need high frequency ping checks</TITLE> </HEAD> <BODY>  Hello, At my organization, our monitoring requirements for our client's WAN interfaces is to ping them once per second. I am using Nagios 2.10 (bundled with Groundwork VM 5.2.1). I have set interval_length to 1 in nagios.cfg. Nagios starts to ping once per second, but then stops for 20-25 seconds at a time before resuming. Is there any way to have Nagios ping evenly once per second? I am attaching the nagios.cfg and copying the relevant portions of it below. Thanks for your help, Todd # SLEEP TIME #sleep_time=1 sleep_time=1 # SERVICE INTER CHECK DELAY METHOD #service_inter_check_delay_method=s service_inter_check_delay_method=n # MAX SERVICE CHECK SPREAD max_service_check_spread=30 # SERVICE INTERLEAVE FACTOR #service_interleave_factor=s service_interleave_factor=1 # MAX CONCURRENT CHECKS max_concurrent_checks=0 # SERVICE REAPER FREQUENCY #service_reaper_frequency=10 service_reaper_frequency=1 # HOST INTER CHECK DELAY METHOD #host_inter_check_delay_method=s host_inter_check_delay_method=n # MAX HOST CHECK SPREAD max_host_check_spread=30 # INTERVAL LENGTH #intevel_length=60 interval_length=1 # AUTO RESCHEDULE CHECKS # auto_reschedule_checks= auto_reschedule_checks=0 # AUTO RESCHEDULING INTERVAL auto_rescheduling_interval=30 # AUTO RESCHEDULING WINDOW auto_rescheduling_window=180 # USE AGRESSIVE HOST CHECKING # use_agressive_host_checking= #use_agressive_host_checking=1 # ENABLE FLAP DETECTION # enable_flap_detection= </BODY> </HTML>