DHCP hosts

[Greg Pangrazio]

If you don't control the router that is handing out DHCP, check to see
if it is cisco, I used to have one dump a file with the dhcp leases to
an ftp server every time a lease was renewed or granted.  You could
also get the admin to send you the dhcp logs and use syslog-ng to
parse them out and provide you with the leases.

Greg Pangrazio
pangrazi at gmail.com





On Fri, Oct 2, 2009 at 3:32 AM, Hari Sekhon <hpsekhon at googlemail.com> wrote:
> Morris, Patrick wrote:
>> G. S. Marzot wrote:
>>> Thank you for the pointer to this cool plugin...
>>>
>>> Unfortunately no solutions to date really fill the bill as the leases
>>> are allocated by a router that does not publish them in a way I know
>>> how to get... nor can I put anything on the DHCP hosts... they are
>>> not under my control...
>>>
>>> Maybe there is a way to hack into my router and get the lease info...
>>> or maybe I need a little daemon that will just go and probe for all
>>> possible hosts... I would just like to see an accurate depiction of
>>> who is on the net at any given time... maybe this is not something
>>> nagios is good at (i.e., dynamic host groups).
>>
>> Nagios is good at what it does, and it really sounds like this just
>> isn't it.
>>
>> However, I don't see a reason you couldn't hack together a really
>> simple check using a tool that *is* good at this sort of thing (like,
>> say, nmap), and based on the results of that tool, feed the results
>> back to Nagios .
>
> I would say that the best thing to do would be to turn off dhcp on that
> router and use dhcpd instead. Open and accessible and then you can just
> use the plugin I wrote... at least I think that would be least amount of
> work for you to get to working solution.
>
> Dhcpd isn't hard and doesn't take long to set up, but I'm not sure on
> your wording, you mean the hosts aren't under your control or the router
> isn't under your control to replace the dhcp service with dhcpd?
>
> If turning off the dhcp from the router isn't an option then you need to
> go back to the drawing board, consider how you can access the system, if
> you have a shell, if you have snmp etc and then come up with another
> solution using that, possibly custom writing your own plugin to
> integrate this in to Nagios.
>
> -h
>
> --
> Hari Sekhon
> http://www.linkedin.com/in/harisekhon
>
>
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------------------------------------------------------------------------------
Come build with us! The BlackBerry® Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9-12, 2009. Register now!
http://p.sf.net/sfu/devconf
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