Who to change passwords in my router

[pgarron]

I want to change all passwords in my router, and I'd like remove usernames , how can I do that?

[thisisshanky]

Usernames are configured as follows.

config t

username cisco password test

to remove it use the no form of the command,

config t

no username cisco

to change all passwords, just configure the new passwords once more using the appropriate commands

like, (enable password , enable secret ) etc.

[pgarron]

If I have all passwords encrypted and I change them. This change keep encrypted?

[thisisshanky]

IF the passwords have been encrypted using " service password-encryption", even when u change, it they will remain encrypted.

[tepatel]

You can configure "no service password-encryption" in the global config to display the passwords clear text.

Any passwords that you enter once you have above command in config, will be displayed in clear text. But those which are already encrypted before above command will still remain encrypted.

[vincent-n]

Just a note about removing username configured on routers. These usernames are usually used for dial backup CHAP/PAP authentication. Removing these usernames would either mean:

1. You're using an empty string password for authentication - provided that the dial backup still work OR

2. Your dial backup will not work because of authentication failure.

Be careful and watch what you're doing. It could mean a disaster. :-).