Hello everybody!

I need to change password on 100+ Mikrotik devices for "admin" user. How can I do it in the fastest way?
Change password on every device manually is not so good

Thank you.

You need to work with a radius server for AAA on all your mikrotik devices

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Maybe, but devices aren't configured to work with radius server...
More variants?

Script that telnets and does the job? You would have it done twice manually before you invent automation...

Use the api, its quick and easy. See http://wiki.mikrotik.com/wiki/API