Could someone please explain what is written here especially the paragraph following the commands
Enter configuration commands, one per line. End with CNTL/Z.
2600A(config)#line aux 0
% Login disabled on line 65, until 'password' is set
Cisco has begun this process of not letting you set the ?login? command before a password
is set on a line because if you set the login command under a line, and then don?t set a password,
the line won?t be usable. And it will prompt for a password that doesn?t exist. So this
is a good thing?a feature, not a hassle!
I guess you might have got the answer, however if not, I'm sure you will get the answer by this post.
Simply put this way:
1. Console was actually desgined to access the router when you are the admin/owner of the router and its in your physical custody. Hence you never need to configure Login and Password for the same!
2. Aux Port was designed to access the Router using a Modem and a Phone Line, for instance you are at home and you wanted to do some modifications (NOT TO START FROM SCRATCH) to an existing router, and if the Modem is Connected to Aux Port and configured, one can access it and configure the same.
However this gives a potential drawback if there is NO Compulsion for Authentication (read username and/or password), imagine somebody knowing the phone number and dialing into it from a rouge country, and rebooting or erasing your config????
Hence to provide a security, the first thing is that, AUX and VTY PORTS MUST BE CONFIGURED WITH LOGIN AND PASSWORD COMMANDS or else its inaccessible.
I hope you got the message.
Secondly, regarding lines, always remember that Cisco Routers, always treat all TTY and VTY connections as lines, starting from Line 0 and Line 1 which are reserved for Con0 and Aux0 and then any other Async Ports in the Router and then finally for VTY 0 - 15 (in old routers its VTY 0 - 4)
I hope it shall be helpful.
If helpful, please rate.