The CCNA Security Class (the first) is going great - the students are terrific. They are learning so much that I decided maybe I should be documenting some of their discoveries. Every class session has been truly terrific, including tonight!
I had beta tested all of the CCNA Security labs prior to the start of the new CCNA Security class and was, therefore, surprised when some of my students were able to issue the "mkdir" command on the router to store their IPS signature file while other students didn't have the "mkdir" command as an option on their routers - even though they were using the same version of ios.
To our surprise, we discovered that the 2811's were using different classes of filesystems. Some of the 2811s were formatted with a Class B Flash file system, known as the low end file system (LEFS)while others were formatted into a Class C Flash file system, which is similar to DOS. Thus, the routers formatted with Class B had no "mkdir" command (as well as some other commands that caused us grief in an earlier lab).
Come to find out, all we needed to do was reformat the internal flash drive using the "format flash:" command and the problem was solved. Presto, we went from a Class B to a Class C and was then able to issue the "mkdir" command! Be sure to make a backup copy of the ios to TFTP server before formating the flash drive.
To determine the type of file system on their routers, the students issued a "show flash: all". The Class C routers displayed geometry and format information that is not displayed on the routers configured with Class B File Systems.
As you may have guessed, not everything these students are learning in the CCNA Security is being 'spoon fed' to them via the curriculum.
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