Cron is a time-based job scheduler in Unix-like computer operating systems. The name cron comes from the word “chronos”, Greek for “time”. Cron enables users to schedule jobs (commands or shell scripts) to run periodically at certain times or dates. It is commonly used to automate system maintenance or administration, though its general-purpose nature means that it can be used for other purposes, such as connecting to the Internet and downloading email. What can I use to schedule a script or a command in Cisco? The kron feature Kron provides the ability to schedule some EXEC command-line interface (CLI) commands [...]

What can I do if I forgot the password in my router? The fastest solution is replace it with the ‘password recovery‘ (you can try to find the password with bruteforce attack but I think it is not the better solution..). During the password recovery procedure, it is fundamental sent the correct ‘Break’ key sequence to enable ROMMON, but, as you know, the ‘break’ sequence depends by the software that you use! Below the standard break key sequence combinations for the most common operating systems.

Spanning tree is a link layer network protocol invented by Radia Perlman, that ensures a loop-free topology for any bridged LAN. Thus, the basic function of STP is to prevent bridge loops and ensuing broadcast radiation. As the name suggests, it creates a spanning tree within a mesh network of connected layer-2 bridges (typically Ethernet switches), and disables those links that are not part of the spanning tree, leaving a single active path between any two network nodes. The STP is a simple protocol, but what is the better way to remember it? Singing!

The Cisco Product Security Incident Response Team (PSIRT) has published one important vulnerability advisory: CiscoWorks Common Services Arbitrary Code Execution Vulnerability CiscoWorks Common Services Arbitrary Code Execution Vulnerability CiscoWorks Common Services for both Oracle Solaris and Microsoft Windows contains a vulnerability that could allow a remote unauthenticated attacker to execute arbitrary code on a host device with privileges of a system administrator.