checking internet connectivity

[Stanley Hopcroft]

Dear Folks,

On Tue, Oct 26, 2004 at 08:55:07AM -0700, nagios-users-request at lists.sourceforge.net wrote:
> 
> Message: 15
> Date: Tue, 26 Oct 2004 12:38:18 +0200
> From: Moritz Both <mb at aldebaran.de>
> Organization: Aldebaran Daten- und Kommunikationssysteme GmbH
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] checking internet connectivity
> 
> 
> Please excuse me if this is a frequently discussed question; i have 
> searched but found it difficult to find good search terms:
> 
> How do folks check Internet connectivity?
> 
>

We use custom plugins to

1 get meta data (HEAD requests) fromwell known internet servers

2 download the start pges (to sample response times) of well known 
servers

and report faults if thresholds are exceeded (eg more than 80% of the 
well known hosts fail to provide document metadata within the timeout 
period).

Here is an example of the second plugin run from the CLI

--getting http://www.delphion.com       2.15 Total check time:  2.15
--getting http://www.altavista.com      0.97 Total check time:  3.12
--getting http://www.whitepages.com.au  0.23 Total check time:  3.35
--getting http://ep.espacenet.com       0.01 Total check time:  3.36
--getting http://www.lycos.com          2.23 Total check time:  5.59
--getting http://www.netscape.com       0.73 Total check time:  6.32
--getting http://www.hotbot.com         0.65 Total check time:  6.97
--getting http://www.google.com         1.43 Total check time:  8.40
--getting http://www.anzwers.com.au     0.01 Total check time:  8.41
--getting http://www.uspto.gov          0.02 Total check time:  8.43
--getting http://www.askjeeves.com      1.77 Total check time: 10.20
--getting http://www.dogpile.com        0.01 Total check time: 10.21
--getting http://www.getthepatent.com   0.01 Total check time: 10.22
Internet performance via "http://Foo-Cache:3128" Transaction 
completed Ok. avg: 0.79 stddev: 0.85  5 worst: 2.23 2.15 1.77 1.43 0.97 
<a href='http://tsitc/cgi-bin/mc7'>graph</a>

We depend not only on connectivity but responsiveness from Internet 
hosts and since these things are influenced by the ISP, we want to 
monitor their performance.

This way of monitoring is treating the Internet as processing a 'web 
transaction', a sequence of URLs with a set of patterns to recognise 
that each part of the transaction has completed or not.

Web transactions were discussed on this list recently.
 
> Thanks for any hints,

> Moritz
> 
> 
> -- 
> Moritz Both


Yours sincerely.

-- 
Stanley Hopcroft

Network specialist, IT Infrastructure
IP Australia
Ph: (02) 6283 3189  Fax: (02) 6281 1353
PO Box 200 Woden  ACT 2606
http://www.ipaustralia.gov.au
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