Alternative SSH-Server – Dropbear

Dropbear is a relatively small open source SSH 2 server. It runs on a variety of POSIX-based platforms.

The perfect environment for this server could be a little low-end system like your mobile phone or BeagleBone.

Installation:

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apt-get install dropbear

Configuration
vim /etc/default/dropbear

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NO_START=0
DROPBEAR_PORT=22
# Alternative dropbear login banner
DROPBEAR_BANNER="/opt/dropbear-banner"