http://certifiedgeek.blogsome.com Just another WordPress weblog Mon, 23 Nov 2009 11:48:51 +0000 http://backend.userland.com/rss092 en Deploying an Open Wireless network for public users can be a bit a pain if you don’t know what is coming. Here are the things I have learned (the hard way) when you deploy such network. Effective spacing between Access Points using the twice the effective range as the distance between ... http://certifiedgeek.blogsome.com/2009/11/23/caveats-in-deploying-open-wifi-network/ While installing Nagios, you might encounter this error message in the web interface: Reading the recommended steps are rather vague and not straightforward. Here are direct steps to check what causing the errors on Nagios installation. 1) Make sure Nagios is running in the background # ps ax | grep nagios 6722 ... http://certifiedgeek.blogsome.com/2009/11/10/nagios-pre-flight-check/ Imagine you have a number of Cisco Wireless Access Points, say 10 spread across your office functioning as some wireless mesh. You need to replace an access point (AP) which giving some problem on the wireless infrastructure. However, you currently dont have any documentation on which APs are mounted on ... http://certifiedgeek.blogsome.com/2009/10/28/locating-a-cisco-access-point-1130ag-physically/ Sometimes Linux administrator/owners wants to restrict access to the Samba server to specific IP addresses since user authentication is not enabled (because of so reasons). Here is a bash script to use iptables to restrict specific hosts via loop statement. # Define the interface where Samba listens IF_INT=eth0 # Define the list of ... http://certifiedgeek.blogsome.com/2009/09/24/iptables-loop-script-for-samba/ I have always been scratching my head whenever I used sudo and the environment variables (env) keep on changing. In my case, I have learned there are two ways to keep/preserve the environment or retain some them when moving into a privilege account (sudo -s). First method, run #sudo -s -E where ... http://certifiedgeek.blogsome.com/2009/09/14/sudo-and-environment-variables/ In a normal switch stack of Cisco Catalyst 3750 (several switches connected with each other functioning as one virtual switch), one switch will make itself the master switch (the one which controls the operations of the stack). In order to make the switch elect itself as master, it needs to ... http://certifiedgeek.blogsome.com/2008/10/13/cisco-quickie-promoting-a-switch-into-a-master-in-switch-stack/ It has been a while I manage to write new stuff given with the new work I am currently dealing but here is the first for this year We just bought some Cisco Wireless Access Point (model 1131AG) but unfortunately these are already in lightweight mode. In this mode, ... http://certifiedgeek.blogsome.com/2008/06/24/how-to-brick-a-cisco-wireless-ap1131ag-aka-downgrading-from-lightweight-mode-to-autonomous-mode/ While updating my knowledge with security tools, I manage to stumble upon this “Hackvertor”. It kinda sounded like a convertor in a more hacker term. For you guys to appreciate this, you should try doing this challenge manually from the Spanner. Then try watching the this video in order to ... http://certifiedgeek.blogsome.com/2007/11/02/hackvertor/ Interested in watching FREE webcasts from Cisco, check these featured webcasts from them. I know some of you might be taken off since these are vendor centric webcasts but we can’t deny Cisco has been and will be around setting the trends of networking and security…. well for the latter ... http://certifiedgeek.blogsome.com/2007/10/31/free-cisco-webcasts-2/ Ever wondered how to provide remote desktop support to one of your non-techie friends who have a problem using their computer. If they are directly connected to the Internet meaning have public IP address assigned to them then this should be a cinch. We have Windows Remote Desktop and a ... http://certifiedgeek.blogsome.com/2007/10/30/remote-desktop-support-without-the-hassle/