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<br>
Gerald,<br>
You could also use this PHP code I wrote a while back to send a
DHCPLEASEQUERY packet<br>
to a server and ask it about a lease like 1.1.1.1 or something you know
is invalid. <br>
This will cause the server to send back a packet stating it has no info
on that lease..which in<br>
turn shows you it is alive and responding. Then just run a cron job on
a remote box or two<br>
which lives in a loop that wakes up periodically, sends a
DHCPLEASEQUERY packet, then<br>
if it gets a response, goes back to sleep. Otherwise, it starts sending
out emails to the<br>
appropriate admins to say that it's unresponsive. <br>
<br>
..or you could be a tad more elaborate and do like I did...write a PHP
daemon that stays<br>
resident on a remote box and makes use of the class above to talk to
the DHCP servers you<br>
want to monitor instead of running a cron job.<br>
<br>
The PHP code for creating/sending DHCPLEASEQUERY packets lives here:<br>
<a class="moz-txt-link-freetext" href="http://www.phpclasses.org/package/6621-PHP-Send-queries-to-a-DHCP-server.html">http://www.phpclasses.org/package/6621-PHP-Send-queries-to-a-DHCP-server.html</a><br>
<br>
Coincidentally, I wrote that class in order to poll the DHCP daemon
each time I receive a <br>
DHCPREQUEST packet with option-82 info in it in order to get timers,
etc. that I otherwise<br>
can't get from tailing the leases file. This lends towards better (and
database driven)<br>
lease tracking..<br>
<br>
Enjoy.<br>
<br>
<pre class="moz-signature" cols="72">--------------------------------------
Patrick T. Winn
Senior Systems Engineer
Cimarron Telephone, Co.
Desk: 918-865-3311 x280
Cell: 918-606-6602</pre>
<br>
<br>
<br>
<br>
On 04/25/2012 06:30 AM, Gerald Vogt wrote:
<blockquote
cite="mid:CAH=StoJyA63sPc2AcCp+1tEjvVp7F+gAnecHbAfKmwCNV_XnzA@mail.gmail.com"
type="cite">Send a DHCP request to the server and wait for the answer.
That's the best method to find out whether it's responding or not...
<div><br>
</div>
<div>Gerald<span></span><br>
<br>
On Wednesday, April 25, 2012, wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-IN">
<div>
<p class="MsoNormal"><span style="color: rgb(13, 13, 13);"
lang="EN-US">Hi,</span></p>
<p class="MsoNormal"><span style="color: rgb(13, 13, 13);"
lang="EN-US">In ISC DHCP-4.2.3 , Is there are any ways to identify
that the DHCP process(dhcpd) is hanging on a deadlock or infinite loop
, though the process state is running.</span></p>
<p class="MsoNormal"><span style="color: rgb(13, 13, 13);"
lang="EN-US">Is there any interface available or methods available?</span></p>
<p class="MsoNormal"><span style="color: rgb(13, 13, 13);"
lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="color: rgb(13, 13, 13);"
lang="EN-US">Regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">Ameen S</span></p>
</div>
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<pre class="moz-signature" cols="72">--
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