<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)">  <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Hello,<o:p></o:p> <o:p> </o:p> I’m monitoring about 30 machines using Nagios with SNMP checks. I also have a DHCP server casting each machine on the network their IP address on start-up. Some machines stay on the majority of the time, others for only 4-8 hours a day. The machines generally maintain their same IP address over time as DHCP is designed to try and give a machine back it’s same IP, so long as it’s available. However, there have been times when a machine has changed its IP addresses as a result of using DHCP on this LAN.<o:p></o:p> <o:p> </o:p> Question:<o:p></o:p> <o:p> </o:p> When I write the host macro for a given machine, e.g:<o:p></o:p> <o:p> </o:p> <pre>define host{<o:p></o:p></pre><pre> host_name random_machine <o:p></o:p></pre><pre> address 192.168.1.100<o:p></o:p></pre><pre> check_command check_ping<o:p></o:p></pre><pre> }<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Is there a way to have nagios use a variable to read its address rather than keep the address static? This would allow me to have a script scan the network, and assign IPs to a given variable which is then read by the host’s *.cfg file in the /etc/objects directory.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Any and all advice is appreciated.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Thank you,<o:p></o:p></pre> <o:p> </o:p> <o:p> </o:p> ---<o:p></o:p> Matt Lozier<o:p></o:p> Network Administrator<o:p></o:p> 972.644.2581, ext. 248<o:p></o:p> 972.661.2701 fax<o:p></o:p> <o:p> </o:p> <a href="http://www.spindletopoil.com/"><img border=0 width=145 height=73 id="_x0000_i1025" src="cid:image001.jpg@01C82A8B.CF52A5E0"></a><o:p></o:p> <o:p></o:p> The information contained in this message or any attached document is confidential and intended only for the individual(s) or entity to which it is addressed. The information should be considered privileged and confidential. If you are not the intended recipient, you are hereby notified that any unauthorized use of the information contained in or transmitted with the communication, or dissemination, distribution, or copying of this communication is strictly prohibited by law. If you have received this communication in error, please inform the sender by immediately returning this communication to the sender and then deleting the original message and any copy of it in your possession.<o:p></o:p> <o:p> </o:p> </div> </body> </html>