Active vs. passive checks; host won't check

[Steve Yates]

Hi,

	I'm a relative newbie to Nagios though I have v2.5 set up,
running, and a couple dozen hosts defined.  I set it up using Monarch.
Nagios is being used to monitor external hosts (that are not running
Nagios) for uptime and POP/HTTP/etc. services using check-host-alive and
check_http, etc.  Parent relationships are defined (internal
router->ext. router->host).

	I have two questions, and the first may help to answer the
second.  I've never been too sure about the difference between active
and passive checks.  What is the difference?  Is there a correct time to
use one or the other?  

	I have one host (a router) that will not check.  Status=PENDING
("Host has not been checked yet") forever.  Active and passive checks
are both enabled.  It is a router, so there are no other services.  Also
I used Monarch to clone it from another router's host definition that
was working.  Any ideas on why it wouldn't be checking?  I can ping it's
IP.

Thanks,

 - Steve Yates
 - ITS, Inc.
 - You can fool too many of the people too much of the time.

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