Thanks for the reply 2009/12/21 Juan Carlos Díaz Fernández <juan.carlos.diaz at ign-solutions.com>: > Or maybe implementing dyndns if you can > This sounds very interesting and it seems GNUDIP is one such. but it seems too dated. it is possible for me to run a dyndns service on a static IP. but can you provide a bit more of gory details about where is it available for centos, and the such. Yes I am using our friend goole while I am typing this for finding some answer Alternatively, it there a possibility of installing some agent and getting the MAC address of one of the server behind the router. First a diagram central location (main monitoring -- Centos box0+monitoring server) | | (Internet) | | +--link1adsl-- Remote1 (dynamic IP) | | +--link2adsl-- Remote2 (dynamic IP) | (and so on...) In each remote I have a centos box behind the router serving a bunch of desktops. Is there a possibility that I can install an agent which will contact the central montoring server? (No $$$ here please, as free as in free beer/bread applies in addition to freedom) BTW it seems there are two type of monitoring tools: Type-1. uses snmp only Type-2. user agents Is it possible to monitor a link based on the MAC of the centos server sitting behind? Zabbix seems to be priced Honestly I am absolutely confused as to which I should choose as it will be maintained by people who may not know what command line is (Sorry!!) Apologies for too many questions. I think somebody mentioned NMS to be complex beasts .. I being a vegetarian am finding it all the more daunting Thanks in advance Rajagopal