==== Trust host key without /dev/tty ====
<code>
ssh -o StrictHostKeyChecking=no <username>@<server>
</code>

==== SSHGuard ====
<code>
iptables -A INPUT -m multiport -p tcp --destination-ports 22 -j sshguard
iptables-save > /etc/iptables/iptables.rules
</code>

==== SSH Tunnel ====

=== Create New Tunnel Account ===
<code>
adduser --shell /usr/sbin/nologin --no-create-home --ingroup sshusers <username>
</code>
You may need to run the following command at first time.
<code>
addgroup sshusers
</code>

=== Open Local Socks Proxy ===
<code>
ssh <username>@<server> -N -D 7070 -v
</code>

=== Open Local Socks Proxy (The Plink Way) ===
<code>
plink <server> -N -ssh -2 -P 22 -l <username> -C -D 7070 -v -pw <password>
</code>

References:

  * http://stackoverflow.com/a/15007556/646735