Dependancy clarification

[James Whittington]

I am trying to better understand Host and service dependancies and if I
really need them for the way I'm unsing nagios.

I am checking a 30 - 40 internet facing services out of a backup
internet link we have.  Each website I manage is set as a host, the
website hostgroup uses check_http to check websites.

When there are hickups on the internet link I get 30 or so pages telling
me all the sites are down.

The current route would be:
Nagios - SOHO - Cable modem - Internet - Pix - Websites

I have tried to set up service dependancies where each segment of the
way depends on each other:
Cable Modem depends on SOHO being up
Internet depends on Cable modem being up
Pix depends on Internet access point being up
Websites depend on PIX being up

But I disconnected the cable modem and still got notifications that the
sites were down.  

I saw a post with a similar discussion about parents, and it was said
that when a host can not be reached because another host in front of it
is down, you get a status of unreachable instead of down, so if you
didn't notify on unreachable status you would be okay. 

So what the default behavior of Nagios 1.2 ?
If a host goes down, are it's services down or unreachable?
Whats the status of a host behind a downed host, is it considered
unreachable?

Thanks in advance for any guidance you all may provide. 

James Whittington
Systems Administrator
TM Floyd & Company 



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