The Cisco Discovery Protocol (CDP) is a Cisco proprietary protocol to share information between directly connected network devices. It’s very useful, especially in a complex network, to discover its topology, for example which switch port a server is connected to. In addition to CDP and other proprietary protocols, a IEEE standard protocol exists, the Link Layer Discovery Protocol…
Today I was virtualizing a Linux server using the latest version of the VMware’s vCenter Converter Standalone and I had a problem: the Helper VM, that is the virtual machine created by the Converter to be the target of the virtualization process, had no default gateway and thus it was unreachable from the other VLANs (including the one the server…
On IIS you can define custom error pages for the different HTTP error codes (for example the code 404 stands for “page not found”). Today I needed to revert the custom error pages to the default ones for a subsite: You can remove the custom configuration forcing the inheritance. Open the Configuration Editor: Choose system.webServer/httpErrors as Section, right-click…
Today I needed to shut down a virtual machine that was unresponsive. I tried to issue the Power off command from the vSphere client but after some minutes it was still in progress… The solution was to kill the process that runs the VM directly on the server where the VM is located, let’s see how to…
When you draw a cicle in Eagle, it normally has only the outline… here’s a quick trick to fill it: Right click on the circle and choose Properties: Set 0 as the Width value:
Today I needed to activate, using my KMS server running on Windows 2008 R2, some desktops and servers with Windows 8 and Windows 2012. First, you need to install an update, KB2885698, to make the KMS server compatible with the latest Microsoft OSes (Windows 8.1 and Windows 2012 R2): Running slmgr.vbs /dlv you can verify the version of…
After having learned how to create a blacklist of SSIDs, today I’d like to share with you a useful opensource tool to prevent simultaneous connection to a wifi and a wired network. From the security point of view it’s indeed important to prevent a device (laptop…) that is connected to the corporate network (trusted) to be…
Today I was asked to prevent the corporate laptops from connecting to a particular wifi network. With the use of a group policy (GPO) it is possible to define a blacklist of SSID; let’s see how to do that…
Today I found a strange problem in a VMWare infrastructure I manage: the connection to the V irtualCenter Server was unstable using both the desktop client and the new webclient. When I connected to the server that runs the VMware VirtualCenter Server service, I noticed that the service kept restarting. In the Windows’ System event…
Today, working on a new library component for Eagle, I noticed that both the pin name (configured in the component’s symbol) and the pad name (configured in the package) were displayed: When you add a new pin in the symbol editor, you can choose which name will be displayed (none, pad name, pin name, both)…